Physics IGCSE – Electricity Complete Answers
1. Insulation
- Used to prevent electrical shocks when touching a wire.
2. Circuit Breakers
- Break the circuit if the current exceeds a safe limit, using an electromagnet to trip a mechanism.
3. Earthing
- Directs excess current safely to the ground, preventing electric shocks if a live wire becomes
disconnected.
4. Double Insulation
- Found in appliances like vacuum cleaners with plastic casings, eliminating the need for an earth wire
to prevent electric shocks.
, 5. Current
- Defined as the rate of flow of electric charge.
6. Current in Metals
- Involves the flow of negatively charged electrons.
7. Measurement of Current
- Measured in Amperes (A) using an ammeter.
8. Conductors
- Materials that allow electric current to flow through them.
9. Equation for Charge
1. Insulation
- Used to prevent electrical shocks when touching a wire.
2. Circuit Breakers
- Break the circuit if the current exceeds a safe limit, using an electromagnet to trip a mechanism.
3. Earthing
- Directs excess current safely to the ground, preventing electric shocks if a live wire becomes
disconnected.
4. Double Insulation
- Found in appliances like vacuum cleaners with plastic casings, eliminating the need for an earth wire
to prevent electric shocks.
, 5. Current
- Defined as the rate of flow of electric charge.
6. Current in Metals
- Involves the flow of negatively charged electrons.
7. Measurement of Current
- Measured in Amperes (A) using an ammeter.
8. Conductors
- Materials that allow electric current to flow through them.
9. Equation for Charge
