Most of the class lost marks rearranging the volt-drop formula in M03, and over half of them made the same slip.
M03 Q2: Rearranging formulae, make L the subject
13 of 18 learners dropped marks on their first try. 7 of them gave 152 m, which is what you get by multiplying by the current instead of dividing by it. So it's mostly one shared mistake, not thirteen different ones.
10-minute reteach: Write V = mV × I × L ÷ 1000 on the board and cover L. In pairs, learners undo each step in reverse (× 1000, ÷ I, ÷ mV) and check by putting their answer back in. Finish with a fresh cable run for the same lathe.
M03 exam question: Volt drop inside the 3% limit
12 learners lost marks here. 9 of them worked out the volt drop correctly but compared it with 5% instead of the 3% limit in the spec, so their cable choice failed the job.
10-minute reteach: Give pairs three volt drops and the 230 V supply. They find 3% of 230 V first, then say pass or fail for each. Two minutes discussing why lighting circuits get the tighter limit.
M05 Q3: Surface area of a cylinder including both ends
11 learners lost marks here. 8 of them left out one or both ends of the tank: their answers are exactly 2πr² short.
10-minute reteach: Unroll a paper cylinder in front of the class: a rectangle and two circles. Learners label each piece with its area, then add them up for the hydraulic tank.
Worth a check-in
- Owen is averaging under half marks on first attempts and hasn't started M04 or M05. Worth a check-in this week.
- Tomasz scored 5 of 12 on M03, his lowest so far.
- Ryan hasn't started M05 yet.
Going well: Concrete Base (M02) went well: the class averaged 78% on first attempts.
Written by AI from the class's first-attempt results. Learners' names are never sent to the AI: it sees them as L1, L2 and so on, and LearnVo puts the names back. It suggests; the tutor decides. It never changes a mark. If the AI isn't available, LearnVo writes the same facts up itself.