1. The load across a 12-V battery consists of a series combination of three resistances are 15 2, 21 2, and 24 2, respectively. What is the magnitude of the circuit current? A. 0.20 A В. 5 А С. 1260 A D. 2 A 2. The load across a 50.0-V battery consists of a series combination of two lamps with resistances of 1252 and 225 Q. What is the total resistance of the circuit? A. 350 2 В. 100 2 C. 125 2 D. 225 2 3. 15.0-2 resistor is connected in series to a 120-v generator and two 10.0-2 resistors that are connected in parallel to each other. What is the total resistance of the load? A. 202 В. 10 8 C. 50 D. 15 2

1. The load across a 12-V battery consists of a series combination of three resistances are 15 2, 21 2, and 24 2, respectively. What is the magnitude of the circuit current? A. 0.20 A В. 5 А С. 1260 A D. 2 A 2. The load across a 50.0-V battery consists of a series combination of two lamps with resistances of 1252 and 225 Q. What is the total resistance of the circuit? A. 350 2 В. 100 2 C. 125 2 D. 225 2 3. 15.0-2 resistor is connected in series to a 120-v generator and two 10.0-2 resistors that are connected in parallel to each other. What is the total resistance of the load? A. 202 В. 10 8 C. 50 D. 15 2

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 70PE: Unreasonable Results (a) What current is needed to transmit 1.00 102 MW of power at 10.0kV? (b)...

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Unreasonable Results (a) What current is needed to transmit 1.00 102 MW of power at 10.0kV? (b) Find the resistance of 1.00 km of wire that would cause a 0.0100% power loss. (c) What is the diameter of a 1.00-km-long copper wire having this resistance? (d) What is unreasonable about these results? (e) Which assumptions are unreasonable, or which premises are inconsistent?
A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any wires used for connections is negligible, (a) What is the current through the resistor? (b) What is the power dissipated by the resistor? (c) What is the power input from the battery; assuming all the electrical power is dissipated by the resistor? (d) What happens to the energy dissipated by the resistor?
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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?
(a) What is the resistance of a 1.00 102-O, a 2.50-k O, and a 4.00-kresistor connected in series? (b) In parallel?
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