Electric circuit. Chapter V review
Answers are for parents and teachers.
1
A 300 W appliance works 10 hours. How many kWh?
3
2
A 2 kW heater works 5 hours. How many kWh?
10
3
Draw the circuit diagram of a torch with conventional symbols.
Battery, switch, bulb, wires — a closed circuit.
4
Write five electrical safety rules for home.
No touching with wet hands; do not use damaged cords; pull from the plug; no objects in sockets; no switching on without adults.
5
Write the power of 3 appliances from their labels and say which uses the most energy.
Depends on the pupil (for example, a 2000 W kettle uses the most).