A capacitor is connected across an ac generator whose frequency is 745 Hz and whose peak output voltage is 140 V. The rms current in the circuit is 3.0 A. When capacitors and inductances are introduced into a DC circuit, we get an AC circuit. The secondary coil has 2,832 loops. Alternating Current. Secondary accidents, ie collapse after stunting, sudden contraction of muscles occurs. A 8.00-nanofarad capacitor is charged up to 14.0 V, then disconnected from the power supply and connected in series through a coil. Why? Examtime Quiz app for Android! The primary coil of a transformer has 941,137 loops. The primary coil of a transformer has 221,792 loops. Alternating currents and voltages Figure 1 shows the plot of alternating voltage and alternating current as a function of time in a circuit that has only a resistor and a source of alternating current — an ac generator. On this page you can read or download nccer alternating current test questions in PDF format. A resource page from Physclips: a multi-level, multimedia introduction to physics (download the animations on this page).. AC electricity is ubiquitous not only in the supply of power, but in electronics and signal processing. a. AC stands for This quiz is incomplete! Alternating current can be defined as a current that changes its magnitude and polarity at regular interval of time. If you don't see any interesting for you, use our search form on bottom ↓ . 1. (a) Find the... 3. Part B What is the instantaneous value of th... An AC current is given by I=480 \sin(9.63t),with I in milli amperes and t in milliseconds. Which of the following can vary with ac, but never with dc? What is the frequency of the v... An inductor has a 48.0 \Omega reactance at 60.0 Hz. 1. Who is Nikola Tesla and why is he popular in Rocky Point? Part 1) If... A capacitor is connected across the terminals of a 110 V rms, 60.0 Hz generator. The root mean square of the outlet's pote... A current that is sinusoidal with respect to time is referred to as \\ A. a direct current. An oscillating voltage of fixed amplitude is applied across a circuit element. The voltage E in volts in a circuit after t seconds (t>70) is given by E=12 sin(120pi times t). Suggest one reason for the fact that the maxima of the output current and output voltage do not occur at the same point in time for AC circuits. In the circuit in the figure above a generator supplies a voltage of E(t) = 50 sin (10 t) V, the inductance is L = 2 H, the resistance is R = 30 ohm, and I(0) = 2. What name is given to current that flows in one direction only? What do you suppose was Edison's motivation for preferring DC? This test is Rated positive by 94% students preparing for NEET.This MCQ test is related to NEET syllabus, prepared by NEET teachers. Explain why. What is the current in the secondary when the lamp is on? (b) in one direction. True or false? When the voltage is 162 V, what is AC current? A) both capacitive and resistive B) both capacitive and inductive C) inductive D) resistive E) capacitive. A source delivers an AC voltage of the form \Deltav = 95.4 sin (60\pi t), where \Deltav is in volts and t is in seconds, to a capacitor. (b) What is the rms value of the current? a. 1) 0.57 A 2) 1.1 A 3) 0.80 A 4) 1.6 A. Direct Current. an = (−1)nbn bn ≥ 0 an = (−1)n+1bn bn ≥ … (a) maximum voltage, (b) rms voltage (... An ac voltage whose peak is 180 V, is across a 3100 ohm resistor. Create an account to browse all assets today, Alternating Current Questions and Answers, Video Lessons A transformer has N1 primary turns and N2 secondary turns. What is the rms value of the current? \\ 1.) b. Answer in units of A. The cables used to transfer electric energy from the generating station to the consumers must be of low resistance to reduce losses due to Joule heating. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a s... What is the Fourier transform of a dc voltage? How do you... A transformer is to be used to provide power for a computer disk drive that needs 5.4 V (rms) instead of the 120 V (rms) from the wall outlet. What is the frequency of the alternating current provided in Canada? AC generator and transformer. A comprehensive database of alternating current quizzes online, test your knowledge with alternating current quiz questions. A. An alternating current E(t) = 120 sin{(121)} has been running through a simple circuit for a long time. Which of the following is not an advantage of using AC? The Hedging principle C. Higher interest costs D. Greater risk of liquidity. As you move to taller grass, the lawn mower blade slows down. An electrical circuit is a complete conductive path through which electrons flow from the source to the load and back to the source. True False Explain. (c) A.C. can not pass through D.C ammeter.... At what two times in the first period following t = 0 does the instantaneous voltage in 81 Hertz Alternating Current equal V_{rms}, Which reactance will increase when the angular frequency in the circuit increases? What role do indicators, capacitor, and resistors play in AC circuits? NEET Physics Chapter Wise Mock Test – Alternating Current. A particular circuit has a resistance of 20 ohms. The Effect Of Alternating Current On The Body. You are riding in a train, gazing into the distance through its window. What is the corresponding peak current? (a) Find the rms current. A constant alternating current is passed into the test surface (between current poles) which forces the alternating current because of skin effect to flow along the contour of the crack. Play this game to review Electricity. As close objects streak by, you notice that the nearby fluorescent lights make dashed streaks. Alternating current is an electric current in which the flow of electrons or charge carriers always reverses its direction many times a second at regular intervals (forward → and ← backward). (b) Find the frequency in Hz. An AC voltage of peak value 161 V and frequency 57.9 Hz is applied to the circuit. Suppose a current is given by the equation I=1.60\sin(230t), where I is in amperes and tin seconds. \\ A. An alternating series is any series, ∑an ∑ a n, for which the series terms can be written in one of the following two forms. Find the phase angle between the current and the voltage. In the US, a typical wall electrical outlet is said to provide 120 volts AC. (Graph) (a) What is the emf frequency f? Students can practice Free online mock tests for Physics for all topics|chapters. Trivia Questions, Electrical Installation Questions! The line is at a potential of 800 kV at the power station and carries the current to a city located... Halogen bulbs have some differences from standard incandescent lightbulbs. The primary coil has a 9 A current and 64 V. Is this a step-up or step-down transformer? Get help with your Alternating current homework. True or false. The voltage supplied to an ac circuit is given by v = 120 sin(377t). The rms value of current through resistor is (a) 5/√2 A (b) 10/√2 A (c) 7/√2 A (d) 7A What happens to the current and voltage going to the lawn mower when... A certain circuit breaker trips when the rms current is 18.5 A. The maximum current in an AC circuit is 3.0 A. The direction and magnitude of the electrons flow however depend on the kind of source. For what capacitance is the rms current 2.8 mA? The period of oscillation of the circuit is then measured to be 8... An AC current is given by I = 475 sin(9.63t), with I in milliamperes and t in milliseconds. An AC generator has emf E = E_m sin(w_{dt} - pi/4), where E_m = 36.9 V and w_d = 313 rad/s. What is the voltage at t = 3 x 10^-3 s? Direct Examination ... density near a given coating defect on the pipeline under test • Signal Current and Voltage effects viewed on instrument’s display CLICK ME. (a) What is the frequency? Suppose a current is given by the equation I = 2.00 sin(250t), where I is in amperes and t in seconds. What is its use? A circuit contains only a(n) 0.234 H inductor. This quiz and worksheet will assess your understanding of calculating alternating current power. Why should a ticker timer connect to an alternate current and not a direct current? what is the peak voltage corresponding to 120 V rms? What are the maximum and minimum values of I? The test that we are going to look into in this section will be a test for alternating series. Alternating current was first created by French Inventor Hippolyte Pixii in 1832 to generate a truly alternating current, a Dynamo electric generator based on Faraday's principal. Here is how you can enable JavaScript. What does the alternating current do? In the AC circuit shown in the figure below, R = 70.0 Ohms and the output voltage of the AC source is (Delta)Vmax sin (omega)t. (a) If (Delta)vR = 0.230 (Delta)Vmax for the first time at t = 0.0115... An alternating current is supplied to an electronic component with a warning that the voltage across it should never exceed 12 V. What is the highest RMS voltage that can be supplied to this compon... A charged capacitor and an inductor are connected at time t = 0. ECDA is a four step process consisting of: 1. A circuit contains only a 48.2 ohm resistor. What will be the maximum current if this inductor is connected to a 50.0 Hz source that produces a 90 V rms voltage? AC. Damped alternating current voltages are generated by charging the test object to a predetermined voltage level and then discharging its capacitance through a suitable inductance. alternating current or voltage completed each second is referred to as the “frequency, f” or “event frequency”. During the discharging stage, a DAC at a frequency dependent on the test … The wall socket provides 130 V. W... Why is alternating current used in homes? (b) What is the maximum curr... Do AC ammeters and voltmeters read maximum, root mean square or average values? Calculate the peak voltage. Calculate the average rate of energy dissipation in the following circuit. Alternating current is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current which flows only in one direction. Electromagnetic Induction and Alternating current For full functionality of this site it is necessary to enable JavaScript. Alternating current (AC) is the type of electric current generated by the vast majority of power plants and used by most power distribution systems.Alternating current is cheaper to generate and has fewer energy losses than direct current when transmitting electricity over long distances. It can also be defined as an electrical current which repeatedly changes or reverses its direction opposite to that of Direct Current or DC which always flows in a … In this scenario, 120 volts refers to: A. Before working on a power transmission line, linemen will touch the line with the back of the hand as a final check that the voltage is zero. A hospital emergency room AC generator operates at a frequency of 60 Hz. AC voltage V(t) has an rms value of 220 V. What is the peak value of this voltage? If you are preparing to appear for any of these exams then make sure that you are thorough with all of the important topics. Can't find the question you're looking for? Alternating current can not be measured by D.C. ammeter because (a) average value of current for the complete cycle is zero. What is the Frequency? Find the frequency in Hz. Which of the following statements is true? In a model AC generator, a 495 turn rectangular coil 6.0 cm by 30 cm rotates at 125 rev/min in a uniform magnetic field of 0.56 T. a) What is the maximum emf induced in the coil? b. If the emf of a coil rotating in a magnetic field is zero at t = 0, and increases to its first peak at t = 0.100 ms. Connect the voltmeter probes on their respective battery terminals. Answer in units of A. What did he invent and how his inventions influenced the world today? How did he alleviate Mark Twain's digestive problems? A. Fluctuates off and on. (a) What is the maximum current in a 6.40 micro F capacitor when it is connected across a North American electrical outlet having delta V_{rms} = 120 V and f = 60.0 Hz? a. (a) What are the rms and peak currents? Determine the... A 210 ohm resistor is connected to an AC source with varepsilon_0 = 9.0 V. (a) What is the peak current through the resistor if the emf frequency is 100 Hz? (a) U_B (b) T... An RL series circuit consists of a 50.0 ohm resistor, a 0.500-H inductor, and an AC voltage source operating at a peak (not rms) voltage of 120.0 V. The frequency of the AC voltage source is 60.0 H... A generator uses a coil that has 260 turns and a 0.65 T magnetic field. Early on Thomas Edison pushed for houses to use DC. Wri... How many inventions did Nikola Tesla make? They have cheaper and simpler gener... What is alternating current? Why the back of the hand? Impedance, phase relations, resonance and RMS quantities. B. Varies in magnitude alone. © copyright 2003-2021 Study.com. To play this quiz, please finish editing it. What does it mean to say that a certain current is 60 Hz? Our online alternating current trivia quizzes can be adapted to suit your requirements for taking some of the top alternating current quizzes. Suppose the emf generated by a coil rotating in a magnetic field is zero at t = 0 and increases to its first peak at t0 = 0.105 ms. Part (a) What is the angular velocity of the coil in rad/s? Quiz: Are You A True Star Wars Series Fan. (b) Find the frequency. Earn Transferable Credit & Get your Degree. A crack acts like an electrical resistance to the current flow thus affecting the voltage for an applied constant alternating current … (b) What is the value of the resistance R? Suppose a current is given by the equation I=1.80\sin250t, where I is in amperes and t in seconds. (c) Motors only use AC while generators only use DC. What determines the frequency of ac produced in a generator? Browse through all study tools. Mar 20,2021 - Test: Alternating Current - From Past 28 Years Questions | 36 Questions MCQ Test has questions of NEET preparation. When did Nikola Tesla invent electricity? Most students of electricity begin their study with what is known as direct current (DC), which is electricity flowing in a constant direction, and/or possessing a voltage with constant polarity. What is the voltage across the inductor at t = 0.50 s? An AC voltage of peak value 332 V and frequency 58.8 Hz is applied to this circuit. All rights reserved. a. Which Harry Potter Hogwarts House Do You Belong To Quiz! The primary coil has a 78 A current and 54V. Which of the following reactions should have the larger emf under standard conditions? (a) Find the rms current. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, … Less Flexible B. 60 watts c. 120 watts d. 720 watts e. 2,400 watts. CBSE papers with answers and solutions for chapter Alternating Current class 12th Physics includes practice question papers with 8-10 questions in each test paper. Find the time required for a 50 Hz alternating current to change its value from zero to the RMS value. (a) What is the maximum voltage. Why? What is the rms current? Calculate the peak current. (c) Draw the resistor's voltage and current phasors t = 15 ms. The electrons flowing through a conducting wire is shown in the above figure. b. Name and state the principle of a simple AC generator. When AC current flows in a circuit, energy is moved into the circuit during the positive half cycle and moved out of the circuit during the negative half cycle. Indirect Inspection 3. c. If it were a DC generator with the same maximum of 1... An AC adaptor for a telephone answering unit uses a transformer to reduce the line voltage of 143 V (rms) to a voltage 7.7 V. The rms current delivered to a answering system is 433 mA. A step-up transformer is designed to have an output voltage of 2200 V (rms) when the primary is connected across a 110 V (rms) source. In an alternating current circuit, voltage can be modeled by a sin function. Explain the advantages of the fuel cell technology. The coil of a generator has 50 loops of the cross-sectional area of 0.25 \; m^2. Test the Alternator Diode; To check for a bad alternator diode, you may want to reset your voltmeter to the lowest possible AC voltage scale setting. The maximum current in a 22 mu F capacitor connected to an ac generator with a frequency of 120 Hz is 0.15 A. The Following Section consists of Multiple Choice Questions on Alternating Current and Voltage. Knowing P = I 2 R . Is this a step-up or step-down transformer? Browse through all study tools. (a) DC is more efficient than AC. The batteries in a portable CD player are recharged by a unit that plugs into a wall socket. If you now decrease the number of turns in the coil to N/... A high-voltage transmission line with a resistance of 0.295 ohm/ km carries a current of 1.20 kA. Half of the outlet's peak voltage B. The value of the instantaneous voltage V at a time t is given by ------... A 90% efficient transformer has 500 primary turns and 10 secondary turns. Alternating Current Quiz Test Questions and Answers. An AC current is given by I = 495 sin (9.63 t), with I in milliamperes and t in milliseconds. The figure given below shows a graph of an ac voltage source output. Multiple Choice Questions on RC Circuits . What is the average voltage? Let’s start the quiz. Event frequency is always measured and expressed in hertz. 2. ACFM probe introduces an alternating current into the test surface (under the … Test your understanding with practice problems and step-by-step solutions. b. The primary coil is connected to an AC source with voltage amplitude V. The secondary coil is connected to a resistor with resistance R. L... An AC source with deltaVmax = 135 V and f = 40.0 Hz is connected between points a and d in the figure below. Figure 1 Current and voltage from an ac source through a simple resistor. 2. Current measurements can be made with a variety of test instruments, but the most widely used pieces of test equipment for making current measurements is a digital multimeter. Explain. Question 1: An alternating voltage V = 30 sin 50t+40 cos 50t is applied to a resistor of resistance 10Ω. You should read “0.00” in the display. Go ahead and submit it to our experts to be answered. In Electrical Engineering, there are basically two types of voltage or current (Electrical Energy) source which defines the kind of circuit and they are; Alternating Current (or voltage) and Direct Current. About This Quiz & Worksheet. Pre-Assessment 2. Access the answers to hundreds of Alternating current questions that are explained in a way that's easy for you to understand. \\ B. an alternating current. Multiple Choice Questions on Magnetism and Electromagnetism. Alternating Current Questions and Answers Test your understanding with practice problems and step-by-step solutions. An alternating current or voltage. Suppose the current through a 24.0 \Omega resistor is I = 1.80sin(210t) where I is in amperes and t is in seconds. The maximum current in the circuit is 0.460 A. (1), Working Scholars® Bringing Tuition-Free College to the Community. a. Determine the following quantities. What is the rms current in this circuit? In terms of the period T of the resulting oscillations, what is the first time at which the following reach a maximum? They have the ability to transmit electricity over larger distances, with fewer energy losses. a. The generator in an AC resistor circuit creates a maximum potential difference across the 175 ohms resistor of 243 V. What is the amplitude of the alternating current if the frequency of the genera... An AC generator consists of eight turns of wire, each of area 0 .0722 m^2, and total resistance of 12 \Omega. What are some of the advantages of alternating current? Alternating Current. Requirements: (a) What is the angular velocity of the coil? Why electricity is transported at high voltages? The maximum current in the circuit is 140... An electric current, I, in amps, is given by I = cos(wt) + sin(wt), where w, not equal to 0, is a constant. (c) If this is the curren... A series AC circuit contains a resistor, an inductor of 240 mH, a capacitor of 5.40 micro F, and a source with delta V_{max} = 240 V operating at 50.0 Hz. What is the peak value of the voltage across this resistor?