Electronic Principles
The knee voltage of a diode is approximately equal to the

Forward voltage
Breakdown voltage
Applied voltage
Barrier potential
None of these

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
dissipating 1 W of power
causing an ac phase shift greater than 90 degree
storing 1 V for 1 second
None of these

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Electronic Principles
Current is

The flow of charged particles through a material
The force that causes electrons to flow
An imbalance of electrical charges
None of these
The number of free electrons in an atom

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