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WAEC - Physics (1990 - No. 49)
How long will it take to heat 3 kg of water from 28
o
C to 88
o
C in an electric taking a current of 6 A from an e.m.f. source of 220V?
96s
1.20s
570s
600s
1200s
解释
Ivt = mcΔθ
t =
mcΔθ
/
Iv
=
3x 4200 x (88 - 28)
/
6 x 200
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