An electric heater is used on a 220-v supply and it consum a current of 3.4A calculate its power and its resistance when it is in use
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potential difference(V)=220 v
current(I)= 3.4A
P=VI
=220*3.4
=748 W
R=V²/P
=220*220/748
=64.705
=64.71 ohm
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