A current that varies with time according to (in ampere
PHYSICS · Subjective · CBSE · Physics · Current Electricity · Current Electricity
Problem
A current that varies with time according to I(t)=2.0+0.50t (in ampere, with t in second) flows through a fixed 4Ω resistor for 5s.
(a) Derive an expression for the instantaneous power dissipated in the resistor as a function of time.
(b) Hence calculate the total electrical energy converted into heat in the resistor during the 5s interval.
(c) Compare this energy with that which would have been produced if the current had remained steady at its initial value of 2.0A for the same duration, and comment briefly on the difference.