Three heaters each rated $250 W$ , $100 V$ are connected in parallel to a $100 V$ supply. The energy supplied in $k W h$ to the three heaters in $5 h o u r s$ is :

3.75 k W h

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4 k W h

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0.6 k W h

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5.74 k W h

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Solution

The correct option is C $3.75 k W h$
The ratings of heater are given as:
The voltage is $100 V$ and the power is $250 W$ ,
time for which energy is suppplied $t = 5 h o u r s$
The energy consumed by the appliance in kWh is given by the formula: $E = P \times t = 250 \times 5 = 1.25 k W h$ .

When three heater are connected in parallel, then the total energy consumed is given as $1.25 k W h \times 3 = 3.75 k W h .$ .

Hence, the total energy consumed is 3.75 kWh.

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