COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 21, Problem 27QAP
To determine
Estimate the ac current in an average household appliance. How much current does an average U.S household draw?
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2. An RC circuit is pictured.
a. Find the current at time t-o.
b. Find the current at time t-0.10 s
c. Find the charge on the capacitor after two time constants have passed.
d.
How long will it take the capacitor to reach 75.0% of its final charge?
C 42 HF
R 5.3 ks (initially uncharged)
Switch
(closed at t-o)
The time constant in an RC circuit is the time it takes
a. so that the current drops to zero.
b. so that the current reaches its maximum value
c. so that the capacitor is fully charged.
d. in which the current decreases to 37% of its initial value.
A potential difference of 5.00 volts is placed across a 250 N circuit element. What current
flows as a result?
O A. 20 mA
O B. 25 mA
O C. 30 mA
O D. 35 mA
Chapter 21 Solutions
COLLEGE PHYSICS
Ch. 21 - Prob. 1QAPCh. 21 - Prob. 2QAPCh. 21 - Prob. 3QAPCh. 21 - Prob. 4QAPCh. 21 - Prob. 5QAPCh. 21 - Prob. 6QAPCh. 21 - Prob. 7QAPCh. 21 - Prob. 8QAPCh. 21 - Prob. 9QAPCh. 21 - Prob. 10QAP
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- The human body can exhibit a wide range of resistances to current depending on the path of the current, contact area, and sweatiness of the skin. Suppose the resistance across the chest from the left hand to the right hand is 1.0 106 . (a) How much voltage is required to cause possible heart fibrillation in a man, which corresponds to 500 mA of direct current? (b) Why should rubber-soled shoes and rubber gloves be worn when working around electricity?arrow_forwardConsider the circuit shown in Figure P28.21 on page 860. (a) Find the voltage across the 3.00-0 resistor, (b) Find the current in the 3.00-12 resistor.arrow_forwardIn this problem, you will verify statements made at the end of the power losses for Example 20.10. (a) What current is needed to transmit 100 MW of power at a voltage of 25.0 kV? (b) Find the power loss in a 1.00 transmission line. (c) What percent loss does this represent?arrow_forward
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