10. Burning waste ______ energy that can be used for electric power or heating.
A: supplies
B: accumulates
C: gathers
D: yields
A: supplies
B: accumulates
C: gathers
D: yields
举一反三
- Burning waste ( ) energy that can be used for electric power or heating. A: gathers B: yields C: supplies D: accumulates
- Burning waste ______ energy that can be used for electric power or heating.
- Heat energy and energy are the middle processes of energy transformation in an electric power plant.
- 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.）
- If 300g of standard coal is used for 1kW.h of electric energy in a power station, the efficiency of generating electricity is (). A: 31% B: 41% C: 51% D: 61%