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Questions  

An ac is given by equation I=I1cosωt+I2sinωt. The rms value of current is given by

a
I1+I22
b
I1+I222
c
I12+I222
d
I12+I222

detailed solution

Correct option is C

I=I1cosωt+I2sinωtI2mean=I12cos2ωt+I22sin2ωt+2I1I2cosωtsinωt=I12××12+I22×12+2I1I2×0Irms=I2mean=I12+I222

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