Derive an expression for electric energy consumed in a device in terms of V,I and t,
Derive an expression for electric energy consumed in a device in terms of V,I and t, where V is the potential difference applied to it, I is the current drawn by it and t is the time for which current flows ?
7 views
1 Answers
We know that work done = W = QV
P =W/t
Now, P =QV/t
V = IR
P =Q/t*IR =I2R
Energy = P × t
= I2R × t
=V2/R2*R*t=V2/R *t
Energy = V2/R
Where V = voltage, R = resistance, t = time
7 views
Answered