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P3.3.2 Mark Scheme Transformers Progress check 1. (a) The ammeter needle will move/will register a reading/ will move from zero/will show a deflection for 1 mark 1 (b) The ammeter needle will show zero/will not register a reading/stay the same for 1 mark 1 (c) The ammeter needle will move/will register a reading/ will move from zero/ will show a deflection The deflection of the needle will be opposite to that when the magnet was pushed into the coil for 1 mark each 2 [4] 2. (a) output voltage less than (the) input voltage or p.d. across output less that p.d. across input or output is (only) 4.2 V (whereas) the input is 230V or WTTE (words to that effect) 1 (b) any two from 2 (made of soft) iron laminated or designed to reduce eddy currents or made of thin slices with slices of insulating material between them core(s) joined to make a ring [3] 3. (a) (i) Iron 1 for 1 mark (ii) V/240 = 2000/10 000 V = 48 V for 1 mark each 3 (b) changing current in primary causes changing (magnetic) field in core links to secondary inducing voltage (emf) in secondary (NOT current) secondary voltage/current is alternating for 1 mark each 4 (c) magnetic field not changing/no electromagnetic induction because direct current for 1 mark each 2 [10] Page 1 of 1