Mains Electricity and Safety Quiz

What is the primary danger associated with damaged insulation in electrical wiring?

• Increased resistance
• Electric shocks or fire hazards
• Reduced current flow
• Short circuits

What happens to cables when high currents pass through thin wires?

• They cool down
• They become insulated
• They overheat
• They increase in resistance

How does dampness affect the risk of electric shock?

• It decreases the risk
• It has no effect
• It increases the risk
• It only affects circuit breakers

What is the function of a fuse in an electrical circuit?

• To increase current flow
• To melt and break the circuit when current exceeds a limit
• To store electrical energy
• To regulate voltage

Which of the following is a common rating for household fuses?

• 1A
• 5A
• 10A
• 20A

What is the purpose of a circuit breaker?

• To increase voltage
• To automatically disconnect the circuit when current exceeds a set value
• To provide insulation
• To store electric charge

What does earthing do in an electrical system?

• Provides a path for current to flow in case of a fault
• Increases the voltage
• Reduces current flow
• Insulates live parts

What is double insulation?

• A method to increase current
• A safety feature ensuring live parts are not accessible
• A type of fuse
• A way to charge objects

How is electric charge measured?

• Amperes
• Volts
• Coulombs
• Ohms

What occurs when two insulators are rubbed together?

• They become conductors
• They transfer electrons, leading to static electricity
• They lose all charge
• They create a magnetic field