Question

an electric heater is rated at 1500w. calculate the heat produced per hour

Answer 1

Rating = 1500W = 1.5kW

Energy Produced = Power x Time

=1.5kW x 1 hr

=1.5kWh

Therefore, the heater produces 1.5 kWh energy, or 5400000 joules every hour.

Answer 2

Given:

• Rating of electric heater = 1500 watt.

To find:

• Heat produced per hour ?

Calculation:

The rating of any electrical device refers to the power output of the device.

• Power output on the other hand refers to the rate of energy consumption (or production) per unit time.

1500 watt means 1500 Joules produced in 1 second.

So, in 1 hour (or 60 × 60 = 3600 sec), the heat output of the electric heater will be :

$H = 1500 \times (60 \times 60)$

$\implies H = 1500 \times 3600$

$\implies H = 54 \times {10}^{5} \: joule$

$\implies H = 5400 \:kilo joule$

So, heat produced in one hour by the device is 5400 KiloJoule.