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Electronic Principles

Electronic Principles
How much power is being dissipated by a 1000 W resistance that has 25 V applied to it?

0.24 W
325 kW
None of these
80 W
0.625 W

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Electronic Principles
A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns?

0.1 A
0.41666666666667
1000 A
100 A
None of these

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Electronic Principles
The current gain of a transistor is defined as the ratio of the collector current to the

supply current
collector current
base current
None of these
emitter current

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Electronic Principles
The valence electron of a copper atom experiences what kind of attraction toward the nucleus?

Impossible to say
Neutral
Weak
Strong
None of these

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Electronic Principles
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

None of these
18 V
24 V
30 V
12 V

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Electronic Principles
A device that converts mechanical into electrical energy is?

solar cell
chemical cell
generator
None of these
thermocouple

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