Question

When electric current flows in a purely resistive circuit electrical energy gets fully converted into heat energy. The amount of heat produced (H) in the circuit is found to be directly proportional to (i) the square of current (I²) (ii) the resistance (R) of the conductor and (iii) the time (t) for which current flows. In other words H = I²Rt. Electrical devices such as an electric fuse, electric heater, electric iron etc. are all based on this effect called heating effect of electric current.

100 J of heat is produced each second in a 4 Ω resistance. Find the potential difference across the resistor.

Why does the cord of an electric heater not glow while the heating element does?

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