Question

An electric heater rated 880w operates for 6 hrs/day find the cost to operate it for 30 days at rs. 3.00 per unit

Answer 1

Energy consumed=880×6×30
=158400 W/hr
=158.4 KW/hr

Cost=158.4×3
=475.2 rupees

Answer 2

Given :

An electric heater rated 880 W operates for 6 hrs/day .

To Find :

The cost to operate it for 30 days at Rs 3.00 per unit .

Solution :

We know , energy is given by :

$E=P \times t$

So , energy required in one day is :

$E=880\ W\times 6\ h=5280\ Wh=5.28\ kWh$

So , cost per day is :

$c=5.28\times 3=15.84$

Therefore , cost to operate for 30 days is :

$C=c \times 30\\\\C=15.84\times 30\\\\C=475.2$

The cost to operate it for 30 days at Rs 3.00 per unit is Rs 475.2 .

Learn More :

Power and Energy

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