fuse, switch, MCB, LIGHTNING CONDUCTOR, EARTH WIRE

What is a device that contains a thin strip of metal that melts if there is too much current through it called?

• third prong

• circuit breaker

• fuse

• short circuit

A current is electrically ______ when charges are able to flow directly into Earth.

• voltage source

• power

• series

• grounded

• static electricity

You want to build a device that can conduct current, but that will be safe if touched by a person. Which of the following pairs of materials could you use?

• glass for the conductor and rubber for the insulator

• copper for the insulator and silver for the conductor

• sand for the conductor and plastic for the insulator

• plastic for the insulator and silver for the conductor

What connects any metal pieces of an appliance to the ground wire of the building?

• third prong

• fuse

• circuit breaker

• short circuit

• grounded

What is the term for a reusable safety switch that breaks the circuit when the current gets too high?

• third prong

• fuse

• circuit breaker

• short circuit

• grounded

Without a fuse or circuit breaker, what might happen in a house with an overloaded electric circuit?

• the thin piece of metal would melt, breaking the circuit

• the metal band would heat up, disrupting the circuit

• a fire would start

• the electricity for the house would turn off

What is the difference between a fuse and a circuit breaker?

• a fuse can only be used once and a circuit breaker is reusable

• a fuse is reusable and a circuit breaker can only be used once

• both fuses and circuit breakers can only be used once

• both fuses and circuit breakers are reusable

The fuse in a circuit melts when:

• An appliance isn't earthed
• Too much current flows
• Too much voltage flows

What's the first thing you should do if someone is shocked electrically?

• Use the fire extinguisher
• Check for breathing and heartbeat
• Turn off the power source
• Remove the person from the power source

a switch that automatically opens if the current in the circuit is too high

• parallel circuit
• circuit breaker
• series circuit
• load