1.

An electric motor takes 5 A from a 220 V line. Determine the power of the motorand the energy consumed in 2 h.

Answer»

Solution :Here ,I = 5 A. V = 220 V,
t = 2 H = (2` xx 60 xx` 60) s = 7200 s
Power P = VI = 220 `xx` 5 = 1100W= 1100 J / s
Now,
Energy CONSUMED W = Pt = 1100 J / s `xx` 7200 s
= 7920000J
`= 7.92 xx 10^6 J`
OR
Energy consumed W = Pt = 1100W `xx` 2 h
= 2200Wh
`=2.2 xx 10^3 Wh`
`= 2.2 kWh`


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