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Home» class 9»Science» Chapter 10: Work and Energy

Find the energy in joules consumed in 10 hours by four devices... - Science

Question

Find the energy in joules consumed in 10 hours by four devices of power 500 W each.

Answer

Given:
Power of one device = 500\text{ W}
Number of devices = 4
Total Power (P) = 4 \times 500 = 2000\text{ W}
Time (t) = 10\text{ hours} = 10 \times 3600\text{ seconds} = 36000\text{ s}

Formula:
Energy (E) = Power \times Time

Calculation:

E = 2000\text{ W} \times 36000\text{ s}
E = 72,000,000\text{ J}
E = 7.2 \times 10^7\text{ J}

Answer:
The energy consumed is 7.2 \times 10^7\text{ J}.