The hot wire ammeter measures:

Important Questions on Alternating Current

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 5

A capacitor is a perfect insulator for:

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 6

A choke coil should have,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 7

An AC voltage source, $V=200\sqrt{2}\sin 100t \mathrm{V}$ is connected across a circuit containing an AC ammeter (it reads rms value) and capacitor of capacity $1 \mathrm{\mu F}$. The reading of ammeter is,

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 8

Average value of A.C. current in a half time period may be

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 9

An alternating current is given by the equation $i=i_1\cos \omega t+i_2\sin \omega t.$ The rms current is given by

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 10

The peak value of A.C. is $2\sqrt{2} \mathrm{amp}.$, its apparent value is- (in ampere)

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 11

$$RMS value of current $i=3+4\sin \left(\omega t+\frac{\pi }{3}\right) \mathrm{A}$ is:

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Alpha Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise-1>Q 12

The peak value of an alternating e.m.f given by $E=E_0 \cos \omega t,$ is$10 \mathrm{V}$  and frequency is $50 \mathrm{Hz}.$ At time $t= \left(\frac{1}{600}\right) \sec ,$ the instantaneous value of e.m.f is: