Question

An electric heater is rated 1500W . How much energy does it use in 10 hours ?

Answer 1

Energy=Power×Time

Energy=1500÷1000×10

Energy=1.5×10

=15kwh

Answer 2

$\textbf{\underline{\underline{According\:to\:the\:Question}}}$    

P = 1500 W

Change in kW

P = 1.5kW

Time = 10 hour

Energy = Power × Time

= 1.5kW × 10 hour

= 15 kWh

= 15 units

Energy Consumed = 15 units