# 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

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

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 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 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 