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

solar cell
piezoelectric device
photodiode
None of these
nicad cell

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Electronic Principles
One henry of inductance is defined as:

None of these
the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the amount of inductance required to change the frequency of a current by 1 Hz
the amount of counter emf required to reduce a current to 1 A
the number of turns of wire in an inductor multiplied by the amount of current flowing through it

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Electronic Principles
Which one of the following statements is true for the impedance of a series RC circuit?

None of these
The impedance is less than the sum of the resistance and capacitive reactance
The impedance is greater than the sum of the resistance and capacitive reactance
The impedance is equal to the sum of the resistance and capacitive reactance
The impedance is greater than either the resistance or capacitive reactance but less than their sum

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