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Electronic Principles

Electronic Principles
A zener diode has a voltage of 10 V and a current of 20 mA. What is the power dissipation?

200 mW
20 mW
300 mW
10 mW
None of these

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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
100 A
0.41666666666667
None of these
1000 A

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Electronic Principles
The voltage across a 1N4001 is 0.93V when the current is 1A. What is the power dissipation of the diode for these values?

0.041666666666667
0.93 W
0.93 V
None of these
9.3 W

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Electronic Principles
In a step-down transformer, which is larger?

Primary voltage
Impossible to say
None of these
Secondary voltage
Neither

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Electronic Principles
A device that converts chemical energy to electrical energy is called a:

thermocouple
electric device
None of these
solar cell
chemical cell

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Electronic Principles
Absolute Zero temperature equals

-273o C
0o C
25o C
-276o C
None of these

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