Ohms Law MCQ Questions & Answers | Electrical Engineering

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11.
What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

A. 8.2 kΩ

B. 820 Ω

C. 8.2 Ω

D. 82 Ω

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12.
A resistance of 3.3 MO is connected across a 500 V source. The resulting current is approximately

A. 15.1 µA

B. 151 µA

C. 66 mA

D. 660 mA

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13.
An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately

A. 385 Ω

B. 38.5 Ω

C. 3.1 Ω

D. 31 Ω

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14.
A current of 200 µA through a 6.8 kΩ resistor produces a voltage drop of

A. 34.4 V

B. 340 V

C. 13.6 V

D. 1.36 V

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15.
How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor?

A. 50 V

B. 500 V

C. 80 V

D. 8 V

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16.
Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

A. 4 Ω

B. 400 Ω

C. 4 kΩ

D. 4.4 Ω

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17.
How much resistance is needed to draw 17.6 mA from a 12 volt source?

A. 212 Ω

B. 6.8 kΩ

C. 68 Ω

D. 680 Ω

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18.
The formula for finding resistance when current and voltage are known is $${\text{R}} = \frac{{\text{I}}}{{\text{V}}}.$$

A. True

B. False

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19.
The formula for finding voltage when resistance and current are known is $${\text{V}} = \frac{{\text{I}}}{{\text{R}}}.$$

A. True

B. False

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20.
When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is

A. 14.4 V

B. 1.4 V

C. 100 V

D. 10 V

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