Electric Circuits
The equation for 25 cycles current sine wave having rms value of 30 amps, will be

 30sin50πt.
 42.4sin25πt.
 42.4sin50πt.
 30sin25πt.

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Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of alternating quantity at any instant.
 The value of alternating frequency at any instant.
 The value of peak current at any instant.
 The value of peak quantity at any instant.

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