20. In which of the following cases more electrical energy is consumed per hour?
1. A current of 1 ampere passed through a resistance of 300 ohms
2. A current of 2 amperes passed through a resistance of 100 ohms.
Answers
Answered by
86
If current is represented as 'i' resistance as 'r', and time 't', then electrical energy e is defined
as,
(Note: time in seconds = t*60 )
first case:
1*1*300*1*60
=18000 Joule
second case:
2*2*100*1*60
= 24000 Joule
Thus second case consumed more in a hour.
as,
(Note: time in seconds = t*60 )
first case:
1*1*300*1*60
=18000 Joule
second case:
2*2*100*1*60
= 24000 Joule
Thus second case consumed more in a hour.
chetan54cg:
Don't you think we have to convert time from hours to seconds
Answered by
7
Explanation:
1.
If current is represented as 'i' resistance as 'r', and time 't', then electrical energy e is defined
as,
e = {i}^{2} *r *t
(Note: time in seconds = t*60 )
first case:
1*1*300*1*60
=18000 Joule
second case:
2*2*100*1*60
= 24000 Joule
Thus second case consumed more in a hour.
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