y10 Homework

Use this mark scheme to mark your work out of 20. Remeber Q4 on H2 was printed incorrectly so the mark scheme may be wrong for this question.

H1 Simple electric current
1 (a) (i) Positive. 1
(ii) Negative. 1
(b) Complete circuit. 1
Current/charge flow. 1
Energy transfer from battery to motor.
Total 5
2 (a) Electrons not stuck to any particular atom. 1
(b) From negative to positive. 1
(c) From positive to negative. 1
(d) The direction of conventional current flow is
from positive to negative (the direction of +ve
charge flow). 1
(e) (i) Lamp connected to cell in complete loop. 1
(ii) Long bar of cell symbol labelled ‘+ve’,
short bar labelled ‘–ve’. 1
(iii) Electron flow labelled from negative
to positive. 1
(iv) Conventional current labelled from positive
to negative. 1
Total 8
3 (a) (i) A charged particle (atom, molecule). 1
(ii) Positive. 1
(iii) Negative. 1
(b) (i) Electrodes and electrolyte connected to cell
in complete loop. 1
(ii) They move towards cathode
(accept negative electrode). 1
(iii) They move towards anode
(accept positive electrode). 1
(iv) Electrons. 1
Total 7


H2 Series and
parallel circuits
1 (a) A, B, C. 1
(b) C, F. 1
Total 2
2 (a) If one lamp stops working, the other lamp will
still work. 1
(b) If one lamp stops working, all the other lamps
stop working too. 1
(c) In parallel. 1
Total 3
3 (a, b, c) Circuit drawn correctly with lamps in parallel. 1
Switch A in the same branch as lamp A. 1
Switch B in the same branch as lamp B. 1
(d) Circuit drawn correctly with a simple switch
between the cell and the junction where
the wires branch. 1
Total 4
4
switch A off off off off
(on or off)
switch B off on off on
(on or off)
‘mains is connected’ on on on on
(on or off)
motor to turn drum off off on on
(on or off)
Heater off off off on
(on or off)
marks 1 1 1 1
Total 4
5 (a) (i) The lamp is brighter than normal. 1
(ii) The lamp is at normal brightness.
(b) (i) 3V. 1
(ii) 1.5V. 1
(c) Parallel. 1
Total 5
6 (a) Diagram showing two cells in parallel. 1
(b) Diagram shows floppy disk drive in parallel
with computer. 1
CD-ROM drive in parallel with computer. 1
Total 3