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.）

Do not let the heater too hot. A: Do not let the heater become too hot. B: Do not let the heater get too hot. C: Do not let the heater grow too hot.

Once installed, this heater operates____________.

heater A: 加热器 B: % C: @

An electric heater draws 10 A from a 120V line. The resistance of the heater is .A. 1200 Ω B. 120 ΩC. 12 Ω D. 1.2 Ω

()An<br/>electric heater draws 10A from a 380-V line. The resistance R of the<br/>heater is () A: 3800Ω B: 380Ω C: 38Ω D: 3.8Ω

For cold environment, heater is necessary for hydraulic system.

Single-An<br/>electric heater draws 10A from a 380-V line. The resistance R of the<br/>heater is () A: 3800Ω B: 380Ω C: 38Ω D: 3.8Ω

中国大学MOOC: This heater consumes _______________ that one does.

For<br/>cold environment, heater is necessary for hydraulic system. ()