Electricity for Cambridge Year 9 QnA.pptx

Questions and answers for Electricity chapter for Cambridge Year 9

1. a) neutral : has no overall charge b) charged : has an overall positive or negative charge c) charge : when a material has more positive protons or negative electrons it has a charge d) earthed : connected to the ground so that any charge can flow to the ground and not build up e) conductor : conducts charge and electrons away quickly f) insulator : does not conduct charge or electrons

2. charged insulator charge conductor charge conductor charge earthed

3. cell / battery series circuit switch parallel circuit

4. on on off off The switches in this circuit depend on each other. The bulbs can be lighted up when a complete circuit is achieved using the two switches.

5. Lamp A will be the brightest as all of the current will flow through it Lamps B and C will be the dimmest because that branch of the circuit has the greatest resistance

6. Lamps Y and Z are connected in series, but they are connected in parallel with lamp X A 2 will show the lowest reading because it is on the branch with the highest resistance A 3 = A 1 + A 2

7. Lamp X will be the brightest because the same voltage is passing along that branch, but there is only one component ( i ) Lamps Y and Z would continue to shine (ii) Lamp Z would go out and Lamp X would continue to shine (iii) Lamp Y would go out and Lamp X would continue to shine

8. b) 3 V Because in a series circuit, the voltage is shared equally between components in a circuit if they are identical // Because in a series circuit, the sum of individual voltage will make up the total voltage of the circuit

9. C, A, D, B, E

10. The ammeter should be connected in series. The voltmeter should be connected in parallel with the buzzer