The potential difference between the terminals of an electric heater is 110V, when its draws a current of 5A from the source. What current will the heater draw and what will be its wattage if the potential difference is increased to 220V. Consider that the resistance of the heater element does not change with temperature.

The potential difference between the terminals of an electric heater i

1.	The potential difference between the terminals of an electric heater is 110V, when its draws a current of 5A from the source. What current will the heater draw and what will be its wattage if the potential difference is increased to 220V. Consider that the resistance of the heater element does not change with temperature.
Answer» Solution :As here V=110V and l=5A HENCE resistance of the electric HEATER `R=V/I=110/5=22 Omega` when potential difference is INCREASED to `V.=220V` then (i) the current `I.=V./R=220/22=10A` (b) the POWER `P.=V.I.=220 times 10=2200W =2.2 kW`