An electric iron drawing 9A from 120v supply mains is operated for 20min ,the energy consumed?
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Given
Current (i) = 9A
V = 120 V
time t = 20 min
= 20 × 60 = 1200 sec
we know that
P = w/t
or P= E/t
=> E = P × t
so E = P × t
= IV × t ( since P= IV )
E = 9A × 120 v × 1200 sec
= 1296000 A × V × sec
=> E = 1296 joule
Current (i) = 9A
V = 120 V
time t = 20 min
= 20 × 60 = 1200 sec
we know that
P = w/t
or P= E/t
=> E = P × t
so E = P × t
= IV × t ( since P= IV )
E = 9A × 120 v × 1200 sec
= 1296000 A × V × sec
=> E = 1296 joule
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