Question

An electric heater is rated 2 kW .What will be the cost if heater is used for 8 hours if electric energy costs Rs 5 per unit ​

Answer 1

Answer:-

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Cost of Heater used for 8 hours = $\bf{80 \: rupees}$

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• Given:-

Electric Heater rated = $\bf{2 \: kW}$

Heater is used for = $\bf{8 \: hours}$

Cost of Electric Energy = $\bf{Rs. 5 \: per \: Unit}$

• To Find:-

Cost of Electric Energy when Heater is used for 8 hours = $\bf{?}$

• Solution:-

Energy consumed in 8 hrs. = Rating of the Electric Heater × 8

Energy consumed in 8 hrs. = 2 kW × 8 h

$\implies\bf{16 \: kWh}$

Given that:-

Cost of 1 kWh = $\bf{Rs.5}$

Cost of 16 kWh = $\bf{16 \times 5 }$

$\implies\bf{Rs.80}$

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Some Additional Information:-

• $\boxed{1 watt \: hour = \bf{3600 J}}$

• $\boxed{1 K \: watt \: hour = \bf{3.6 \times 10^6 J}}$

• $\boxed{1 \: Horse \: Power [HP] = \bf{746 \: watt}}$

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