Household Electrical Safety and Wiring Quiz

Why is the earth wire considered a safety feature rather than an essential part of the basic circuit?

• It carries current during normal operation
• It only carries current during fault conditions
• It completes the circuit with the neutral wire
• It reduces the voltage in the circuit

If you were to replace a fuse in an appliance that normally draws 2.8 amperes, which rating would be most appropriate?

• 1A fuse
• 3A fuse
• 5A fuse
• 13A fuse

Why are switches always connected to the live wire rather than the neutral wire?

• To make installation easier
• To reduce current flow
• To ensure the appliance is fully disconnected from the dangerous voltage when switched off
• Because the neutral wire is too busy

What safety hazard might exist if a metal-cased appliance is missing its earth wire?

• The appliance won't turn on
• A fault could make the case live without blowing the fuse
• The appliance will use more electricity
• The neutral wire won't work properly

Why do plastic-cased appliances often not require an earth wire?

• Plastic is a cheaper material
• Plastic doesn't conduct electricity well
• Plastic is more durable
• Plastic is lighter than metal

What is the relationship between an appliance's normal operating current and its fuse rating?

• The fuse rating should be exactly equal to normal current
• The fuse rating should be slightly higher than normal current
• The fuse rating should be much higher than normal current
• The fuse rating should be lower than normal current

Why is the live wire considered more dangerous than the neutral wire?

• It's brown in color
• It carries a higher voltage
• It's thinner than the neutral wire
• It's connected to more appliances

In a properly functioning circuit, when does the earth wire carry current?

• All the time
• Never
• Only during a fault condition
• Only when the appliance is switched off

Why is tin used for the wire inside a fuse?

• It's the cheapest metal available
• It has a specific melting point suitable for protection
• It's the most conductive metal
• It's the easiest metal to see through the glass

What could happen if a fuse rating is too high for an appliance?

• The appliance will work more efficiently
• The appliance won't turn on
• The fuse won't protect against dangerous overcurrents
• The appliance will use less electricity