28. Write the joules law of heating.
In the household 5 tube lights of 40 W each are used for 5
hours and an electric press of 500 W for 4 hours every day.
Calculate the total energy consumed by the tube light and
press in a month of 30 days.
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Answer:
Electrical energy consumed by 5 tubes lights of 40 watt each for 5 hours per day
= 5 × 40× 5 = 1000Wh = 1 kWh
Electrical energy consumed by electric press of 500 W for 4 hours per day
= 500×4=2000kw = 2 kWh
Total energy consumed per day
= 1 kWh + 2 kWh = 3 kWh
Total energy consumed in a month of 30 days
E = 3 kWh × 30 = 90 kWh
I hope this will help you.
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