Lightning

Lightning is a huge light seen when positively charged clouds meet the negatively charged clouds during a storm.
Note:

Lightning is a form of static electricity in nature.
Qn. Why is lightning said to be electricity?
Lightning involves electric charges.
Qn. What causes lightning?
Lightning is caused by charges of static electricity in clouds.
Thunder
Qn. What is thunder?
Thunder is the sound that is suddenly produced when surrounding air becomes strongly heated, expands and contracts during lightning. Qn. How is thunder caused?
Thunder is caused by the sudden expansion and contraction of air between opposite charged clouds.
Note:
The continuous noise or sound heard during thunder is due to echoes.
Qn. Why is lightning seen before thunder is heard?
Light travels faster than sound.
Qn. How is lightning useful in the environment?
Lightning fixes nitrogen in the soil.
Qn. State the dangers of lightning.
Lightning strikes people and animals to death.
Lightning sets buildings on fire.
Lightning can lead to forest fires.
Lightning can damage people’s property.
Qn. State ways of preventing dangers of lightning.
Putting lightning conductors on tall buildings.
Never stand under trees when it is raining.
Switch off electric appliance when it is raining.
Always wear rubber shoes when it is raining.
Avoid swimming in open water when it is raining.
Never stand in open places when it is raining.
A diagram showing a lightning conductor

Qn. How does a lightning conductor control lightning?

A lightning conductor directs electric charges to the metal strip in the ground without damaging the building.
Qn. State the uses of electricity.
Electricity is used for cooking.
Electricity is used for ironing clothes.
Electricity is used for lightning bulbs.
Electricity is used for washing.
Electricity is used to run some machines.
Qn. Give the advantages of using electricity.
Electricity is quick.
Electricity provides clean work.
Electricity controls the cutting of trees.
Electricity does not pollute the environment.
Qn. State the dangers of electricity.
Electricity shocks and kills people.
Electricity can burn buildings.
Qn. Identify the safety precautions when handling electricity.
Never touch an electric socket with wet hands.
Never push metallic objects in electric sockets.
Switch off electric appliances when it is raining.
Never repair electric appliances if you are not an expert.
Never through objects on electric wires.
Never touch electric wires that have fallen down.
Avoid over loading the circuit.