if an electric bulb of 100 watt is lighted for 3 hours daily. How much electrical energy would be consumed daily? Also find the cost if cost per unit is 3 rs.
Answers
Explanation:
Given, P= 100 W
T= 3hrs
Using E = VIT
= 100X3
= 300 J
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Given :electric bulb of 100 W is lighted for 3 hours daily
cost per unit 3 rupees
To Find : How much electrical energy would be consumed daily .
cost
Solution:
electric bulb of 100 W
Hence Energy consumed in 1 hr = 100 Wh
Lighted daily for 3 hrs
Hence Energy consumed in a day = 3 x 100
= 300 Wh
1 Joule = 1 Watt. sec
1 hr = 3600
= 300 x 3600 Joule
= 108000 Joule
= 108 kJoule
Energy consumed in a day 108 kJoule
Energy Consumed daily = 300 Wh
1 unit = 1 kWh = 1000 Wh
300 Wh = 300/1000 kWh
=> 300 Wh = 0.3 kWh
=> 300 Wh = 0.3 unit
Energy Consumed daily = 0.3 unit
cost per unit = 3 Rs
Daily cost = 0.3 x 3 = 0.9 Rs
Cost = Rs 0.9 or 90 Paise
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