A 3.3kW electric heater is connected to a 220VAC supply. （1）Calculate the current drawn from the supplyA. （2）Calculate the resistance of the heating element（2.s.f.）Ω （3）Calculate the energy (in kWh) used by the heater in a 24 hour periodkWh （4）If the supply voltage drops to 208V, what is the power used by the heater.kW（2s.f.）
举一反三
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