COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 21, Problem 41QAP
To determine
The current passes through the secondary coil.
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Students have asked these similar questions
1
EXAMPLE 21–10 Cell phone charger. The charger for a cell phone contains a
transformer that reduces 120-V (or 240-V) ac to 5.0-V ac to charge the 3.7-V
battery (Section 19–4). (It also contains diodes to change the 5.0-V ac to 5.0-V dc.)
Suppose the secondary coil contains 30 turns and the charger supplies 700 mA.
Calculate (a) the number of turns in the primary coil, (b) the current in the
primary, and (c) the power transformed.
5 (28-Mar) mp4ems- Examples
Example 15.6: Page 687
A transformer on a utility pole steps the rms
voltage down from 12 kV to 240 V. (a) What is
the ratio of the number of secondary turns to
the number of primary turns?
(b) If the input current to the transformer is
2.0 A, what is the output current?
(c) Determine the power
transmission line if the total resistance of the
transmission line is 200 0.
loss in the
Consider the oscillation circuit shown.During the portion of the cycle when the capacitor’s top plate is positive and the amount of charge is increasing, the current through the inductor isA. Clockwise and increasing. B. Clockwise and decreasing.C. Zero. D. Counterclockwise and increasing.E. Counterclockwise and decreasing.
Chapter 21 Solutions
COLLEGE PHYSICS
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- Neon signs require 12-kV for their operation. A transformer is to be used to change the voltage from 220-V (rms) ac to 12-kV (rms) ac. What must the ratio be of turns in the secondary winding to the turns in the primary winding? (b) What is the maximum rms current the neon lamps can draw if the fuse in the primary winding goes off at 0.5 A? (C) How much power is used by the neon sign when it is drawing the maximum current allowed by the fuse in the primary winding?arrow_forwardA step-up transformer is designed to have an output voltage of 2 200 V (rms) when the primary is connected across a 110-V (rms) source. (a) If the primary winding has exactly 80 turns, how many turns are required on the secondary? (b) If a load resistor across the secondary draws a current of 1.50 A, what is the current in the primary, assuming ideal conditions? (c) What If? If the transformer actually has an efficiency of 95.0%, what is the current in the primary when the secondary current is 1.20 A?arrow_forward(a) Use the exact exponential treatment to find how much time is required to bring the current through an 80.0 mH inductor in series with a 15.0 (resistor to 99.0% of its final value, starting from zero. (b) Compare your answer to the approximate treatment using integral numbers of (c) Discuss how significant the difference is.arrow_forward
- An RL circuit consists of a 40.0 (resistor and a 3.00 mH inductor. (a) Find its impedance Z at l60.0 Hz and 10.0 kHz. (b) Compare these values of Z with mouse found in Example 23.12 in which there was also a capacitor.arrow_forwardA precision laboratory resistor is made of a coil of wire 1.50 cm in diameter and 4.00 cm long, and it has 500 turns. (a) What is its self-inductance? (b) What average emf is induced it the 12.0 A current through it is turned on in 5.00 ms (one-fourth of a cycle for 50 Hz AC)? (c) What is its inductance if it is shortened to half its length and counter-wound (two layers of 250 turns in opposite directions)?arrow_forwardSuppose you have a supply of inductors ranging from 1.00 nH to 10.0 H, and capacitors ranging from 1.00 pF to 0.100 F. What is the range of resonant frequencies than can be achieved from combinations of a single inductor and a single capacitor?arrow_forward
- An LC circuit consists of a 3.00 mH inductor and a 5.00 (F capacitor. (a) Find its impedance at 60.00 Hz and 10.0 kHz. (b) Compare these values of Z with those found in Example 23.12 in which there was also a resistor.arrow_forwardA step-down transformer is used for recharging the batteries of portable electronic devices. The turns ratio N2/N1 for a particular transformer used in a DVD player is 1:13. When used with 120-V (rms) household service, the transformer draws an rms current of 20.0 mA from the house outlet. Find (a) the rms output voltage of the transformer and (b) the power delivered to the DVD player.arrow_forward#11 Step Up Transformer A transformer primary coil has 2,300 windings, while the sec- ondary coil has 12,400 windings. If the primary coil is operated at a RMS voltage of 10.0 V, what is the RMS voltage in the secondary coil? A. 1.86 V В. 24.1 V С. 53.9 V D. 120 Varrow_forward
- The output current of a transformer in which the voltage is stepped down is usually higher than the input current. Explain why?arrow_forward11 - Four resistors, one uncharged capacitor and two inductors are arranged as shown in the figure. Then a potential difference eo is applied across the circuit as shown. Just after S is closed, what is the current through resistor R3 ? R2 R, a R3 LI L2 R 4. а) R1+R2+R3+RĄ E0 b) R1+R4 E0 c) R3 e) O R1+R2+R3 Boş bırakarrow_forwardIn a non-ideal transformer, provide a physical explanation as to why the current in the primary coil changes when the resistor in the secondary coil changes.arrow_forward
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