Please see my attachment. From the circuit
Energy transferred to the load E = Ir + IR, where r is the internal resistance and R is Load Resistance. so
I = E/(r+R)
The Power W is W = I^2R = E^2R/(r+R)^2
Upto this i understand. I can't understand the following steps
As R changes, so does W. W will be maximum when dW/dR is zero
that is d/dR(E^2R/(r+R)^2) = 0
My question is why W is maximum when dW/dR = 0. Why dW/dR concept is introduced here
Energy transferred to the load E = Ir + IR, where r is the internal resistance and R is Load Resistance. so
I = E/(r+R)
The Power W is W = I^2R = E^2R/(r+R)^2
Upto this i understand. I can't understand the following steps
As R changes, so does W. W will be maximum when dW/dR is zero
that is d/dR(E^2R/(r+R)^2) = 0
My question is why W is maximum when dW/dR = 0. Why dW/dR concept is introduced here
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