Pretest 9: Safe Electricity Application

It is a device that maintains steady supply of voltage to your appliances at home.

• fuse

• resistor

• circuit breaker

• voltage regulator

Which of the following statements is NOT true about safety devices used at home?

• Safety devices are used to prevent electric shock.

• Safety devices cut the flow of current in case of overloading.

• Safety devices are used to provide alternative route for current in the case of a grounded circuit.

• Safety devices supply unsteady amount of voltage to protect appliances against overloading.

The fuse at home has “blown” up many times. Which of the following must NOT be done to solve the problem and prevent it from happening again?

• Buy fuse with standard amperage rating.

• Do not use all appliances simultaneously.

• Call your barangay electrician to fix your electrical problem.

• Use jumper wire or cover the blown fuse with available silver paper.

Which electrical device shuts down when there is overloading in the circuit?

• fuse

• voltage source

• circuit breaker

• electrical switch

Which electrical device blows up when there is overloading in the circuit?

• fuse

• switch

• resistor

• circuit breaker

Why is earthing used at home?

• To prevent short circuit

• To cut the circuit in case of overloading

• To reduce the resistance of the appliance

• To provide alternative route of upsurge current in case of grounded circuit.

At home, you noticed that a portion of an electrical wire is worn out, exposing its metallic part. What do you think might happen if you will just ignore this problem?

• short circuit may happen

• circuit is of better condition

• overloading may not happen

• nothing happens when someone touches the wire

What electrical circuit condition in which current returns and takes the path of metal casing of an appliance?

• short circuit

• series circuit

• parallel circuit

• grounded circuit

Which of the following directs any excess current in the metal casing of appliances to the ground?

• fuse

• earthing

• circuit breaker

• electric sockets

Which electrical connection involves plugging of several devices to an outlet or to an extension wire with multiple outlets?

• earthing

• single insulation

• double insulation

• octopus connection