Question

Current electricity heating effect by charge numericals

Answer 1

Heating Effect of Electric Current

When electric current is supplied to a purely resistive conductor, the energy of electric current is dissipated entirely in the form of heat and as a result, resistor gets heated. The heating of resistor because of dissipation of electrical energy is commonly known as Heating Effect of Electric Current. Some examples are as follows:

When electric energy is supplied to an electric bulb, the filament gets heated because of which it gives light. The heating of electric bulb happens because of heating effect of electric current.

When an electric iron is connected to an electric circuit, the element of electric iron gets heated because of dissipation of electric energy, which heats the electric iron. The element of electric iron is a purely resistive conductor. This happens because of heating effect of electric current

Example 1: If an electric heater consumes electricity at the rate of 500W and the potential difference between the two terminals of electric circuit is 250V, calculate the electric current and resistance through the circuit.

Solution: Given, power input (P) = 500 W
Potential difference (V) = 250 V
Electric current (I) =?
Resistance (R) through the circuit =?

We know that power (P) = VI

Or, 500 W = 250 V x I

Or, I = 500 W ÷ 250 V = 2 A

We know, resistance R = V/I

Or, R = 250 V ÷ 2 A = 125 Ω