from 600 kΩ to 200 kΩ accept by 400 kΩ 1 (c) (i) no numbers for intensity or light intensity is categoric / a description / not continuous not enough results is insufficient 1 (ii) YES mark is for the reason both show that resistance increases with decreasing intensity / brightness accept they both get the same results / pattern 1 (d) A circuit that automatically switches outside lights on when it gets dark. 1 [7] M15. (a) electric current (rate of) flow of (electric) charge / electrons accept with Q and t correctly named 1 potential difference work done / energy transferred per coulomb of charge (that passes between two points in a circuit) accept with W and Q correctly named 1 (b) metals contain free electrons (and ions) accept mobile for free 1
from 600 kΩ to 200 kΩ accept by 400 kΩ 1 (c) (i) no numbers for intensity or light intensity is categoric / a description / not continuous not enough results is insufficient 1 (ii) YES mark is for the reason both show that resistance increases with decreasing intensity / brightness accept they both get the same results / pattern 1 (d) A circuit that automatically switches outside lights on when it gets dark. 1 [7] M15. (a) electric current (rate of) flow of (electric) charge / electrons accept with Q and t correctly named 1 potential difference work done / energy transferred per coulomb of charge (that passes between two points in a circuit) accept with W and Q correctly named 1 (b) metals contain free electrons (and ions) accept mobile for free 1