- Why doesn't current flow when a switch is open?
- What happens to the current through a globe when the voltage is increased? Why does this happen? Explain in terms of energy and movement of charge.
- What happens to the brightness of the globe when more current flows through it? Why does this happen? Explain in terms of movement of charge through the filament.
- Examine and explain any difference to the brightness and current values when two globes are connected in series, compared with one globe.
- What happens to the other globe if one of the globes in series breaks?
- Examine and explain any difference in the ammeter reading when two globes are connected in parallel and switched on, compared with a one globe.
- What happens to the other globe if one of the globes in parallel breaks?
- How do you think that lights in a house are connected? Give two reasons why you think that is the case.
- What is the resistance of one of these globes?
- What is the resistance of two globes in series?
- What is the resistance of two globes in parallel?
- Which of the combination circuits (1 or 2) has the lowest overall resistance? How can you tell?
- In the final circuit, why does the first globe get brighter when both of the other globes are switched on?
- In the final circuit, why does the ammeter reading increase when all 3 globes are connected compared to only two? Explain with reference to movement of charge.
- In the final circuit, consider the voltage across each of the 3 globes when they are switched on and explain this with reference to movement of charge.
|
