OHM'S LAW QUIZ

Four amperes of current are measured through a 24 resistor connected across a voltage source. How much voltage does the source produce?

96 V

9.6 V

960 V

8 V

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A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?

2 mA

214 mA

21.4 mA

2.2 mA

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If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?

8 V

320 V

32 V

3.2 V

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What is the voltage source for a circuit carrying 2 A of current through a 36 resistor?

1.8 V

72 V

7.2 V

18 V

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The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately

18

11.2

1.2

112

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If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is

22 k

220 k

220

2.2 k

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The formula to find I when the values of V and R are known is

I = VR

I = V/R

I = R/V

V = IR

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How much current is produced by a voltage of 18 kV across a 15 k resistance?

120 mA

1.2 A

12 A

12 mA

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An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately

3.1

385

31

38.5

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A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

2

20

40

4

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