Electronic Principles
One henry of inductance is defined as:

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

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Electronic Principles
The period of a waveform is:

the time required for the voltage to rise from 10% to 90% of the peak amplitude
equal to 0.707 times the peak amplitude
the time required to complete one full cycle
None of these
the number of cycles completed in one second

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