Physics · May / June 2019 · Paper 21 · Question 8
5054
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The question as text
Fig. 8.1 shows a circuit diagram containing a 2000 Ω resistor of constant resistance and a thermistor. thermistor 12 V 2000 Ω Fig. 8.1
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8(a)(i)[2]
8(a)(ii)[2]
8(b)(either)[2]
(increased current in coil causes) coil / core / relay to become magnetised coil / core attracts (iron / magnetic) switch
8(b)(or)[2]
transistor switches on / (gives) high (collector) current occurs when base and emitter voltage is high (> 0.6 V) or small current into base gives larger output / collector current
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