4583

Physics Current Electricity Level: Misc Level

Wire A has a potential difference of 50 V across it and carries a current of 2 A. Wire B has a potential difference of 100 V across it and also carries a current of 2 A. Compare the resistances, rates of flow of charge, and rates of flow of energy in the two wires.

4582

Physics Current Electricity Level: Misc Level

A 120 -V electric coffeepot draws a current of 0.6 A. What is the resistance of its heating element?

4419

Physics Current Electricity Level: Misc Level

What is the total resistance of a parallel circuit that has three branches with resistance of 2 ohms, 2.5 ohms,, and 4 ohms?

8.5 ohms, 1.15 ohms, 2.83 ohms, 0.87 ohm

4418

Physics Current Electricity Level: Misc Level

Four resistors in a series circuit are as follows r 1 = 15 ohms, r 2 = 30 ohms, r 3 = 45 ohms, r 4 = 60 ohms. What a voltage of 220 volts across the terminals of the electromotive force, the current in the circuit will be?. 368 amp, 1.47 amps, .682 amp, 5.87 amps

4416

Physics Current Electricity Level: Misc Level

In your manufacturing company you have 10 lights that have a voltage across them of 200 volts,and the total current used by the lamps is 30 amps. At $ 1. 40 per kwhr, what is the cost of operating the lights for 12hours?

280, 175.6, 100.8, 56.2

4414

Physics Current Electricity Level: Misc Level

The power input required by a dc electric motor that is run on a 220 volt line and draws 10 amps is ?

22 watts, 220 watts, 2200 watts, 22,000 watts.

4001

Physics Current Electricity Level: University

Resistance
Determine the total resistance.

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3835

Physics Current Electricity Level: University

How much current will flow through the 8.0 Ohm resistor?
a. 1.0A
b. 0.29A
c. 0.50A
d. 2.0 A
e. none of the other responses is

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3834

Physics Current Electricity Level: University

 Current & Charge
In a certain DC circuit 1.50A of current flows through a 4.00 Ohm metal resistor for a period of 90.0S. During this time interval what is the net number of electrons that have passed through a cross- section of the resistor?
a. 135
b. 8.43 x 10^20
C. 3.37 x 10^21
d. 1.04 x 10^17
e. 5.06 x 10^21

3805

Physics Current Electricity Level: University

Power and Resistance
An electric heater is basically a wire through which the electric current flows. What is the resistance of such a heater if its power is 1000W  and it is used in a regular home so that the voltage is 110 V.