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15/07/2021 1:54 pm
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An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.
(a) How much charge flows around the circuit each second?
(b) How much energy is transferred to the heater each second?
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15/07/2021 1:57 pm
p.d = 230 V, I = 8 A
(a) I = Q/t
8 = Q/1
Q = 8 x 1 = 8C
So, 8C of charge flows around the circuit each second.
(b) Energy transferred = work done
p.d = Work done/Charge moved
230 = Work done/8
Work done = 230 x 8 = 1840 J
Energy transferred = 1840 J