First slide
Alternating Current and voltage
Question

An AC current is given by  I=I1sinωt+I2cosωt. A hot wire ammeter will give a reading:

Moderate
Solution

 Hot wire ammeter read =rms value of current Given AC I=I1sinωt+I2cosωt I2=I12sin2ωt+I22cos2ωt +2I1I2sinωtcosωt<I2>=I12<sin2ωt>+I22<cos2ωt> +I1I2<sin2ωt><I2>=I122+I222 + 0 Irms=<I2>=I12+I222

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