1. Year 10 Electricity Alternative to Practical Mark Scheme
Total /35

2. Question 1 Table: l in m [1]
V in V, I in A, R in Ω (words or symbols) [1]
R values , , (2 or more sig figs) [1]
R values consistent 2 or 3 sig figs. [1]
b. R (directly) proportional to l o.w.t.t.e. [1]
Numerical example given, allow two ratios [1]
Idea of within limits of experimental accuracy [1]
c. Prediction 10 – no unit needed. [1]
Working shown [1]
d. Two from: Wire gets hot / burns out
Meter damaged, wire gets floppy / expands, higher meter readings / readings off scale, power source cuts out / fuses, resistance of wire increases. [2]
Total [11]

3. Question 2 Correct symbol for voltmeter [1] In parallel with lamp [1]
b. i. units all correct [1]
ii. R values correct (10, 14, 18, 21) [1]
Consistent 2 or 3 sig figures in R column [1]
c. Statement matches results (expect No) [1]
R figures quoted appropriately, matching statement [1]
Mention of Brightness related to temperature [1]
Total [8]

4. Question 3
0.3 – [1]
b. Ω, A [1]
[1]
c. Correct calculation of 0.5 Io shown (e.c.f) [1]
10 (Ω) [1]
d. Diagram: Resistors in parallel [1]
Voltmeter symbol [1]
Voltmeter position [1]
Total [8]

5. Question 4 i. V1 = 0.7 (V) [1] I = o.45 (A) [1]
ii. R1 =1.56 or 1.6 (Ω) e.c. f. (i.) [1]
b. V2 = 0.6 (V) and V3 = 0.5 (V) c.a.o. [1]
c. 1.8 (V) e.c.f. V1 V2 V3 [1]
d. Correct symbols for ammeter, lamp, voltmeter [1]
Correct parallel circuit with ammeter and voltmeter correctly connected [1]
e. Statement matches candidate’s results and idea of within / beyond limits of experimental accuracy or that values are too far apart / too different. [1]
Total [8]