Science Grade 5: Safety Electrical Devices

1. Safety Electrical Devices

8. Safety Electrical Devices

9. 1. Fuse- a fuse can cause the main electric
circuit in a house to open and cause a brown-
out.
- The fuse is made up of a strip of metal that
melts easily when there is overloading or over
heating. It is placed on the main switch to
prevent the outbreak of a fire.
- When the fuse blows, it is a sign that there is
something wrong in the circuit.

11. 2. Plug- a plug is used for each household
appliance. Thus allows electricity to flow freely
when plugged on.
- After use, the plug should be pulled out to save
electricity.
- Plugs enable people to use electricity in their
homes, offices, schools and any place where
electric power is needed.

13. 3. Electric meter- Every month, a personnel
from the power company like ISECO, reads
the electric meter.
- The electric meter measures the electrical
consumption at a given time.
- It tells how many kilowatt hour have been
used by a household.

15. 4. Switch- The switch helps you to easily turn
on and turn off the electric circuit without
any danger.
- It opens and closes a circuit.
- It is covered by a plastic to prevent
touching the electrical wire in a circuit.

17. 5. Transformer- It is a device used to control
the voltage of electricity.
- A transformer can either raise or lower
the voltage of electricity.
- Imported appliances from the United
States and other European countries have
110 volts. A step up transformer is
needed to make these appliances work.

19. What are the five safety devices?
 Fuse
 Plug
 Electric meter
 Switch
 Transformer

20. Identify what is being described.
1. It is a device used to control the voltage of
electricity.
 Transformer
2. It is placed on the main switch to prevent the
outbreak of a fire.
 Fuse
3. This device measures the electrical consumption
at a given time.
 Electric meter

21. 4. It enable people to use electricity in their
homes, offices, schools and any place
where electric power is needed.
 Plug
5. It helps you to easily turn on and turn off
the electric circuit without any danger.
 Switch