Back to: PRIMARY SEVEN SCIENCE NOTES
Conductors of electricity
Conductors are materials that allow electricity to pass through them .
Examples of conductors of electricity.
1. Metals like; Iron, copper, Tin, Silver, zinc, lead, brass.
ii. Materials like; spoons, pair of compasses, razor blades e.t.c.
iii. Water from rivers, lakes, springs and wells.
iv. Carbon {non metallic conductor)
v. Salt solution.
vi. Wet wood.
N.B:
1. Wet wood is a good conductor of electricity because it contains minerals.
2. Pure water does not conduct electricity because it doesn’t contain minerals.
3. Silver is the best conductor of electricity.
4. We use aluminum to make electric wires because silver is expensive and rare.
Insulators of electricity.
These are materials that do not allow electricity to pass through them easily.
Examples of insulators;
- Rubber, plastic, dry wood, dry paper, dry cloth, air and porcelain
Importance of insulators
1. Used to insulate flat irons to prevent electric shocks.
2. Prevent conductors from meeting to cause short circuits.
Electric circuit (lesson five)
An electric circuit is a path through which an electric current flows.
Components of an electric circuit.
- A switch.
- A torch bulb
- A conductor (wire)
- Dry cells
- The conducting wire.
- Fuse
Questions.
- How are insulators different from conductors of heat?
- Give any two examples of insulators.
- How are insulators important in our daily life?
- State any two components of an electric circuit.
- Why is wood said to be bad conductor of electricity?