Mains electricity Quiz

What is mains electricity?

• Direct current supplied to homes

• Alternating current supplied to homes

• Battery power supplied to homes

• Solar power supplied to homes

What is the voltage of mains electricity in the UK?

• 120 volts

• 230 volts

• 50 volts

• 240 volts

What is the frequency of mains electricity in the UK?

• 60 hertz

• 40 hertz

• 50 hertz

• 30 hertz

What is the role of a socket in an electrical circuit?

• Connects an appliance to the mains supply

• Provides safety by directing stray current to the ground

• A fixed outlet where electrical plugs are inserted

• Alternates between positive and negative voltage

What is the purpose of insulation in electrical wiring?

• To increase current flow

• To prevent accidental contact with the live wire

• To reduce voltage

• To store electrical energy

How does AC current differ from DC current?

• AC current flows in one direction only

• AC current alternates direction, changing its polarity regularly

• DC current alternates direction

• DC current changes its polarity regularly

What type of current is used in mains electricity?

• Direct current (DC)

• Alternating current (AC)

• Static current

• Pulsating current

What safety devices help protect against electrical hazards?

• Fuses, circuit breakers, and earth wires

• Transformers and capacitors

• Resistors and inductors

• Diodes and transistors

What is the primary function of a circuit breaker in an electrical system?

• To store electrical energy

• To convert AC to DC

• To prevent overload by breaking the circuit

• To increase the voltage

Which material is commonly used for electrical wiring due to its conductivity?

• Aluminum

• Plastic

• Copper

• Iron