PHYS 402 Bossier Parish Community College Current & Resistance Worksheet The detail is attached, thanks ! ! ! Current & Resistance Worksheet PHYS 402 Sec 0

PHYS 402 Bossier Parish Community College Current & Resistance Worksheet The detail is attached, thanks ! ! ! Current & Resistance Worksheet
PHYS 402 Sec 01
Summer 2020
Tuesday, July 14, 2020
Problem 1. What is the current in milliamperes produced by the solar cells of a pocket calculator through
which 4.00 C of charge passes in 4.00 h?
Problem 2.
(a.) A defibrillator sends a 6.00 A current through the chest of a patient by applying a 10, 000 V potential as
in the figure above. What is the resistance of the path?
(b.) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the
path of resistance. Discuss the difficulties that would ensue if a larger voltage were used to produce the
same current through the patient, but with the path having perhaps 50 times the resistance.
Hint: The current must be about the same, so a higher voltage would imply greater power. Use this
equation for power: P = I 2 R.
Problem 3. Calculate the effective resistance of a pocket calculator that has a 1.35 V battery and through
which 0.200 mA flows.
Problem 4. The diameter of a 0-gauge copper wire is 8.252 mm. Find the resistance of a 1.00-km length of
such wire used for power transmission.
Problem 5. Of what material is a resistor made if its resistance is 40.0% greater at 100 o C than at 20 o C?
Consult the tables on the last page.
Problem 6. A cauterizer, used to stop bleeding in surgery, puts out 2.00 mA at 15.0 kV .
(a.) What is its power output?
(b.) What is the resistance of the path?
Problem 7. A light-rail commuter train draws 630 A of 650-V DC electricity when accelerating.
(a.) What is its power consumption rate in kilowatts?
(b.) How long does it take to reach 20.0 m/s starting from rest if its loaded mass is 5.30 × 104 kg, assuming
95.0% efficiency and constant power?
(c.) Find its average acceleration.
(d.) Discuss how the acceleration you found for the light-rail train compares to what might be typical for an
automobile.
Problem 8. A 100 W lightbulb carries a current of 0.83 A. How much charge flows through the bulb in
1 minute?
Problem 9. A 15 Ω resistor is connected to the terminals of a 1.5 V battery.
(a.) Draw a graph showing the potential as a function of distance traveled through the circuit, starting from
V = 0 V at the negative terminal of the battery.
(b.) What is the current in the circuit?

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