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What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h ?
- a)43.75
- b)70
- c)43,750
- d)70,000
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
What is the kilowatt-hour consumption of a 40 W lamp if it remains on ...
1 KW/1000 W = 40 W/ x W.
Solve for x and you'll get the number of watts.
x= 40 w * 1750 hr ( the hrs that the lamp remain on).
= 70 Whr.
Most Upvoted Answer
What is the kilowatt-hour consumption of a 40 W lamp if it remains on ...
Given:
Power of lamp (P) = 40 W
Time for which lamp remains on (t) = 1750 h
To find:
Kilowatt-hour (kWh) consumption of the lamp
Solution:
1. First, we need to calculate the energy consumed by the lamp in joules.
Energy (E) = Power x Time
E = P × t
E = 40 W × 1750 h = 70000 Wh
2. We need to convert Wh to kWh as the electricity bill is charged in kilowatt-hours.
1 kWh = 1000 Wh
70000 Wh = 70000/1000 kWh = 70 kWh
Answer:
The kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h is 70 kWh (option B).
Power of lamp (P) = 40 W
Time for which lamp remains on (t) = 1750 h
To find:
Kilowatt-hour (kWh) consumption of the lamp
Solution:
1. First, we need to calculate the energy consumed by the lamp in joules.
Energy (E) = Power x Time
E = P × t
E = 40 W × 1750 h = 70000 Wh
2. We need to convert Wh to kWh as the electricity bill is charged in kilowatt-hours.
1 kWh = 1000 Wh
70000 Wh = 70000/1000 kWh = 70 kWh
Answer:
The kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h is 70 kWh (option B).
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Community Answer
What is the kilowatt-hour consumption of a 40 W lamp if it remains on ...
Very simple .
KWh = ( watt × hrs ) ÷ 1000. 》 This is formula remember this .
Then. KWh = ( 40 × 1750 ) ÷ 1000
is 70 .
KWh = ( watt × hrs ) ÷ 1000. 》 This is formula remember this .
Then. KWh = ( 40 × 1750 ) ÷ 1000
is 70 .
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