Activity 7.5:
Aim: To study the relationship between electric charges and electric current.
Apparatus: Van de Graaff generator, galvanometer and connecting wire
Instruction
1. Set up the apparatus as shown in Figure 7.7.
2. Switch on the Van de Graaff generator and observe the pointer on the galvanometer.
Questions
1. What happens to the galvanometer’s pointer? Explain.
2. How do you show the existence of electric charges on the dome of the generator?
3. State the meaning of electric current.
Answer:
1. The pointer of the galvanometer deflects. This shows that there is a flow of charges to the Earth.
2. Place the metal cap of an electroscope close to the dome of the Van de Graaff generator. The divergence of the gold leaf shows the presence of charges.
3. Electric current is the rate of electric charges flowing through a conductor.
Aim: To study the relationship between electric charges and electric current.
Apparatus: Van de Graaff generator, galvanometer and connecting wire
Instruction
1. Set up the apparatus as shown in Figure 7.7.
2. Switch on the Van de Graaff generator and observe the pointer on the galvanometer.
Questions
1. What happens to the galvanometer’s pointer? Explain.
2. How do you show the existence of electric charges on the dome of the generator?
3. State the meaning of electric current.
Answer:
1. The pointer of the galvanometer deflects. This shows that there is a flow of charges to the Earth.
2. Place the metal cap of an electroscope close to the dome of the Van de Graaff generator. The divergence of the gold leaf shows the presence of charges.
3. Electric current is the rate of electric charges flowing through a conductor.