Tags: Class 9 , Physics , Work and Energy Asked by Rajat Sinha
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The relation between power and energy is
Energy = Power x Time
If, Power = 1500 Watt, Time = 10 Hours
Then,
Energy = 1500 Watt x 10 Hours = 15000 Watt-hr
Answered on: 2016/07/11 by ExamFear
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Power= 1500w=1500/1000=1.5kw Time=10 hours Energy=power×time 1.5×10 =15kWh.....
Answered on: 2017/12/12 by Kiran
Last updated at June 8, 2019 by
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NCERT Question 14 An electric heater is rated 1500 W. How much energy does it use in 10 hours? Given Power = 1500 W Time taken = 10 hours We know that Power = (𝐸𝑛𝑒𝑟𝑔𝑦 𝑐𝑜𝑛𝑠𝑢𝑚𝑒𝑑)/(𝑇𝑖𝑚𝑒 𝑡𝑎𝑘𝑒𝑛) Energy consumed = Power × Time taken = 1500 × 10 = 15000 Wh = 15000/1000 kWh = 15 kWh Energy consumed is 15 kWh
Answer :
We know that, \( P \ = \ \frac{W}{T} \)
Where,
Power rating of the heater,(P) = 1500 W = 1.5 KW
T = 10 hrs, \(\space \)
Work done = Energy consumed by the heater
\(\therefore energy \ consumed \ = \ Power \ × \ Time \)
\(\Rightarrow 1.5 \ × \ 10 \ = \ 15 \ kWh \)
Hence, the energy consumed by the heater in 10 hrs is 15 kWh.
Text Solution
Answer : 15 kWh (Unit)
Solution : Energy consumed by an electric heater can be obtained with the help of the expression, <br> P = W/T <br> Where, <br> Power rating of the heating, `P= 1500 W = 1.5 W` <br> Time for which the heater has operated, `T = 10 h` <br> Work done = Energy consumed by the heater <br> Therefore, energy consumed = Power `xx` Time <br> `= 1.5 xx 10 = 15 kWh` <br> Hence, the energy consumed by the heater in 10 h is 15 kWh.
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An electric heater is rated 1500 W. How much energy does it use in 10 hours?
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