iStarSign inScience 9 · Unit 9: Electricity · Cambridge Lower Secondary Science Stage 9
9.2 Current and voltage in parallel circuits
19 questions · e.g. What voltage is across each parallel lamp?
Questions
1. How is a voltmeter connected?
Check2. How is an ammeter connected?
Check3. A 12 V battery is made of 1.5 V cells connected in series. How many cells does it contain?
Check- Check
5. What is the unit of voltage?
Check6. What does the voltage of a battery show?
- the energy that the battery can supply
- the current from the battery
- the length and width of the battery
7. Which component measures voltage?
Check8. A lamp and a buzzer are in parallel with a 1.5 V cell. What is the voltage across the lamp?
Check- Check
- They add up to the voltage of the cell.
- Each has double the cell's voltage.
- Each one has the same voltage as the cell.
- They have no voltage.
- Check
- Check
13. Arun connects three 12 V lamps in series to a 12 V battery. Why don't they work properly?
- Each lamp only gets 4 V, so they are dim.
- Each lamp gets 36 V and burns out.
- The battery is too weak to make any current.
- The lamps are in parallel.
14. How should Arun connect three 12 V lamps to a 12 V battery so they work properly?
- with the battery reversed
- with only one wire
- in parallel, so each lamp gets 12 V
- in series, so each lamp gets 12 V
15. Another identical lamp is added in series with lamp L1. What happens?
- The current rises and the voltage across L1 rises.
- The current falls and the voltage across L1 falls.
- The current falls but the voltage across L1 stays the same.
- Nothing changes.
- Check
17. Another identical lamp is added in parallel with L1. What happens to the voltage across L1?
Check- Check
- Check