An electric heater of resistance is connected to a mains supply.
MATHEMATICS · Multi-part · ISC · Physics · Current Electricity · Electrical energy and power
Problem
An electric heater of resistance 10Ω is connected to a 220V mains supply.
(a) Calculate the power consumed by the heater.
(b) A second heater of resistance 20Ω is now connected in parallel with the first heater across the same 220V supply. Calculate the new total power drawn from the mains.
(c) Find the percentage increase in power consumption when the second heater is added.