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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
300 mW
10 mW
20 mW
None of these

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Electronic Principles
Doubling the operating frequency of a capacitive circuit:

has no effect on the capacitive reactance
None of these
multiplies the capacitive reactance by 6.28
cuts the capacitive reactance in half
doubles the amount of a capacitive reactance

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Electronic Principles
What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

Mechanical energy
Solar energy
None of these
Electronical energy
Chemical energy

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Electronic Principles
A battery is a device composed of one or more:

None of these
solar cells
piezoeletric cells
voltage generators
chemical cells

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Electronic Principles
Suppose a step-down transformer has a turns ration of 5:1. If the secondary current is 1A rms, what is the primary-current?

0.2 A
None of these
0.4 A
0.6 A
0.3 A

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Electronic Principles
Current can flow through a normally open push button switch as long as:

None of these
its contact remain open
its contact remain open
you are not pressing the button
you are pressing the button

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