What determines the rate at which energy is delivered by a current?

Compute the heat generated while transferring 96000 coulombs of charge in one hour through a potential difference of 50 V.

An electric iron of resistance20 takes a current of 5 A. Calculate the heat developed in 30 s.

An electric motor takes 5A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the ratio R/R' is: