Question

an electric kettle of 1500 ohm works on 230 volt supply. the electrical energy consumed when the heater works for one heating​

Answer 1

Answer of this question is 2

Answer 2

Given:

Resistance of kettle = 1500 ohm

Voltage = 230V

To find:

Electrical energy consumed

Solution:

Here the electrical energy is converted to heat energy, thus complying with Joule's Law which states that heat generated in conductor that carries current , electric kettle in this case , is directly proportional to the  square of voltage , time taken for heating and inversely proportional to the resistance of the conductor.

Taking one heating $= 1 hour$$= 3600 seconds$

∴ Energy consumed $= H= \frac{V^2\times t}{R}$  $\Rightarrow H= \frac{230\times230\times 3600}{1500}$

$\Rightarrow H = 126960 Joules$ ( Answer )