4.2.4. Resistance
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 302 questions
A student changes the current in a filament lamp. She measures the current and the potential difference (p.d.) across the lamp. is an incomplete circuit diagram. On , complete the unfinished circuit symbols. One pair of readings for the lamp is shown in the table. p.d. / V current /A 6.0 1.2 Calculate the resistance of the filament in the lamp for these readings. resistance of filament = Ω After many hours of use, the filament wire in a lamp becomes thinner. State the effect, if any, on the resistance of the lamp. Complete the circuit in to show a battery connected to three lamps arranged in parallel. Describe two advantages of connecting these lamps in parallel with the battery.
0625_m16_qp_32
THEORY
2016
Paper 3, Variant 2
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shows 3 lamps and a fuse connected to a power supply. 220 V The e.m.f. of the supply is 220 V. Each lamp is labelled 220 V, 40 W. The rating of the fuse is 2.0 A. Calculate the current in each lamp, current = the current in the fuse, current = the total number of lamps, all in parallel, that could be connected without blowing the fuse. number = After a very long period of use, the wire filament of one of the lamps becomes thinner. Underline the effect of this change on the resistance of the filament. resistance increases resistance remains the same resistance decreases State and explain the effect of this change on the power of the lamp.
0625_m16_qp_42
THEORY
2016
Paper 4, Variant 2
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Questions Discovered
302