A $4 k W$ heater is connected to a $220 V$ source of power. Calculate
iii. the electrical energy consumed in 2 hours use of the heater

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Solution

Step 1- Given Data and formulas
The power rating of the heater $P = 4 k W$
Time of use of the heater $t = 2 h$
The electrical energy consumed is given by
$E = P t$
where $E$ is the energy consumed.
Step 2- Finding the electrical energy consumed in 2 hours
Substitute the values in the equation to find the electrical energy consumed.
$E = 4 k W \times 2 h E = 8 k W h$
Final answer: The electrical energy consumed in 2 hours of use of the heater is $8 k W h$ .

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