1.

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

Answer»

Current (I) is in-phase with the voltage.

I = V/R amps. 

P = I * V * cosϕ or I2 R watts. (Where cosϕ is zero because the voltage and current are in-phase. So cosϕ 0° (zero) = 1) 



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