1.

What is the relation between voltage and current in AC circuit containing only inductance? 

Answer»

Current (I) is lags behind the voltage by 90°.

I = V/XL amps. 

XL = 2πfL ohms. 

P = I * V * cosϕ watts. (Where cosϕ is 90 because current lags behind voltage by 90°. So cosϕ 90° = 0) 

∴ P = I * V * 0 = 0 watts. 



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