# NCERT Solutions Class 9 Science Solutions for Work and Energy - Exercise 11.5 in Chapter 11 - Work and Energy

Question 11 Work and Energy - Exercise 11.5

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

With the help of the expression, energy consumed by an electric heater will be

obtained,

P = T

Where,

The power rating of the heater,

P = 500 W = 1.5 power unit Time that the heater has operated,

T = ten h Work done = Energy consumed by the heater

Therefore, energy consumed = Power × Time

= 1.5 × 10 = 15 kWh

Hence, the energy consumed by the heater in 10h is 15 kWh.

Video transcript
"hello students welcome to leader learning this is ashwini i teach science at leader so here we have a question that is an electric heater is rated 1500 watt we have the power it is in what so 1500 what how much energy does it use in 10 hours we have to find the energy usage okay with the help of the expression energy consumed by an electric heater will be obtained where the power rating of the heater is p equals to 1500 watt so here we can convert it 1500 divided by 1000 okay so we got the value it is 1.5 power per unit time okay it is per unit time so we got it as 1.5 power per unit time now time is basically we have to find it for 10 hours so we can write it as 10 hours here work done equals to energy consumed by the heater okay it is basically the energy consumed by the heater therefore energy consumed equals to power into time so we got the values we just put the values in this equation we have power is 1.5 multiplied by time is 10 so here we got our answer it is 15 right so hence the energy consumed by the heater in 10r is 15 here is the answer that the energy consumed by the heater is 10 in 10 r is 15 kilowatt per hour if you have any doubts then please put it down in the comment section for more such video solutions please subscribe leader learning thank you "
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