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
举一反三
- ()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
- 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.）
- There's an electric( heater) in the bedroom. A: 空调 B: 暖炉
- 设总体的方差为120，从总体中抽取容量为10的样本，则样本均值的方差等于（） A: 120 B: 1.2 C: 12 D: 1200
- This heater consumes _______________ that one does. A: electric power twice as great as B: greater twice electric powe C: twice as great electric power as D: twice greater electric powe