Electrical Safety Flashcards
What is the heating effect of current?
The production of heat when current flows through a conductor due to electrical resistance.
Why are damp conditions dangerous with electrical equipment?
Water can conduct electricity, increasing the risk of electric shocks.
Why is damaged insulation hazardous?
It can expose live wires, increasing the risk of electric shocks and fires.
What factors increase the heating effect of current?
Higher current and higher resistance in the conductor.
What is a fuse?
A device with a thin wire that melts if the current is too high, breaking the circuit.
What is the risk of overheating cables?
Overheating can melt insulation and lead to fires.
Why is overloading plugs or sockets dangerous?
Excess current can overheat wires, leading to fires.
What should you consider when choosing a fuse rating?
The fuse rating should be slightly higher than the normal operating current of the appliance.
How does a trip switch work?
It automatically disconnects the circuit if the current exceeds a safe level.
What is double insulation?
A method of insulating appliances so that the outer casing is non-conducting.
How does earthing protect users?
It directs excess current safely into the ground, away from the user.
What is the purpose of earthing in electrical appliances?
To provide a safe path for electricity if there’s a fault, preventing electric shocks.
Why is fuse rating important?
The correct rating ensures the fuse will break the circuit before overheating occurs.
Why are some appliances double-insulated?
To prevent electric shocks if internal wires touch the outer casing.
What is a live wire?
The wire that carries the current to an appliance.
