Irfaan loves black coffee. A roadside stall selling a cup of black coffee at Rs. 120, offered 25% discount to Irfaan. If Irfaan was willing to pay even Rs. 200 for this cup of black coffee, Irfaan's consumer surplus is
A source maintains a current I in a resistor of resistor of resistance R. If V is the potential difference across the resistor. The electrical energy dissipated in the resistor in time is given _____