Generators turn:
- Kinetic energy into electrical energy
- Electrical energy into kinetic.
- Heat into electrical energy.
- Power into electrical energy.
Overhead cables are dangerous if you touch them. This is because:
- The voltage is very low and the current is very low.
- The voltage is high, but the current is very low
- The voltage is low and the current is high.
- The voltage is high and the current is high.
Mains electricity is distributed about the country using:
- Batteries
- Low voltage wires called the national grid
- High voltage wires called the national grid.
- None of these; each town has its own power station.
The formula for power in Physics Code is:
Physics Codes: I - current; V - voltage; P - power; R - Resistance.
- P = IR
- P = IV
- P = V/R
- P = V/I
Which one of these correctly describes mains voltage in Europe?
- 110 V dc
- 230 V dc
- 230 V ac at 50 Hz
- 230 V ac at 60 Hz