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Electronic Principles

Electronic Principles
What is the barrier potential of a silicon diode at room temperature?

0.3V
None of these
0.7V
1 V
2 m V per degree Celsius

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Electronic Principles
Silicon atoms combine into an orderly pattern called a

Crystal
Covalent bond
Semiconductor
None of these
Valence orbit

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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 power dissipation of a resistance when you know the voltage drop and current?

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

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Electronic Principles
At room temperature an intrinsic semiconductor has

many holes
None of these
many free electrons
No holes
a few free electrons and holes

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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
24 V
30 V
12 V
18 V

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Electronic Principles
A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?

None of these
700 V
208 V
707 V
651 V

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