Question

An electric kettle is rated at 25 W. Calculate the (a) quantity of thermal energy generated in 2 s​

Answer 1

Answer:

An electric kettle is rated at 25 W, the quantity of thermal energy generated in 2 s​ is 50J

Explanation:

• We know that when current is passed through a conductor heat will produce in it, from joules law of heating we have the amount of heat energy produced $H=I^{2}Rt$

       where,

        H- the heat energy produced

        I- current given

        R- resistance

        t- the time taken

• The power can be calculated as $P=I^{2} R$

From the question, we have given that

the power of the electric kettle $P=25W$

time of generation of heat $t=2s$

the thermal energy generated is $H=25*2=50J$