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Electronic Principles

Electronic Principles
How much current flows through a 60-W light bulb that is operating at 120 V?

180 A
0.5A
None of these
7200 A
0.083333333333333

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Electronic Principles
What is the turns ratio for the transformer specified in the above question?

0.707
None of these
0.575
10.738
1.5

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Electronic Principles
The merging of a free electron and a hole is called

Covalent bonding
Thermal energy
Lifetime
None of these
Recombination

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Electronic Principles
An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

None of these
24.2 mA
34.4 mA
28.4 mA
68.4 mA

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Electronic Principles
Which one of the following equations most directly determines the power dissipation of a resistance when you know the voltage drop and amount of resistance?

P = E2/R
P = I2R
P = IE
I = P/E
None of these

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Electronic Principles
In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point

off the load line
down
nowhere
None of these
up

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