Electrical Engineering - Ohm's Law

Exercise :: Ohm's Law - General Questions

21. 

When 12 V are applied across a 68 resistor, the current is

A. 816 mA
B. 17.6 mA
C. 176 mA
D. 8.16 mA

Answer: Option C

Explanation:

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22. 

Approximately how much current flows through a 3.3 M resistor across a 30 V source?

A. 9 A
B. 90 A
C. 900 A
D. 9000 A

Answer: Option A

Explanation:

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23. 

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.

A. 40
B. 4
C. 2
D. 20

Answer: Option D

Explanation:

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24. 

What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?

A. 183
B. 18.3
C. 66
D. 6.6

Answer: Option A

Explanation:

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25. 

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

A. 8.2 k
B. 820
C. 8.2
D. 82

Answer: Option D

Explanation:

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