Electrical Engineering - Ohm's Law

Exercise :: Ohm's Law - General Questions

11. 

A resistance of 3.3 M 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

Answer: Option B

Explanation:

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12. 

You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?

A. 9 V
B. 900 mV
C. 0 V
D. 18 V

Answer: Option A

Explanation:

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13. 

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

A. 112
B. 11.2
C. 1.2
D. 18

Answer: Option A

Explanation:

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14. 

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?

A. 8 V
B. 320 V
C. 3.2 V
D. 32 V

Answer: Option D

Explanation:

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15. 

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

A. 220 k
B. 22 k
C. 2.2 k
D. 220

Answer: Option C

Explanation:

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