Paper 2 H - SAMPLE SET 1 Q3
(3) A student investigates how the resistance of a thermistor varies with temperature.
(a) The student sets up the circuit shown in Figure 5 to measure current and voltage.
He finds that it does not work.
(a) The student sets up the circuit shown in Figure 5 to measure current and voltage.
He finds that it does not work.
Give three modifications the student should make to the circuit so that the circuit works correctly. (3)
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(b) The student uses the equipment shown in Figure 6 to measure the temperature of the thermistor.
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(b) The student uses the equipment shown in Figure 6 to measure the temperature of the thermistor.
(i) Give one reason for using the water bath. (1)
(ii) The equipment shown in Figure 6 is for investigations in the temperature range from 20°C to 100°C.
State one way the student could develop this experimental procedure to investigate temperatures outside this range. (1)
(c) The student takes measurements for two other components, A and B. The results for both these components are shown in Figure 7.
(ii) The equipment shown in Figure 6 is for investigations in the temperature range from 20°C to 100°C.
State one way the student could develop this experimental procedure to investigate temperatures outside this range. (1)
(c) The student takes measurements for two other components, A and B. The results for both these components are shown in Figure 7.
(i) Compare and contrast how the resistances of component A and component B vary with temperature. (3)
(ii) Component A is connected to a 12V supply.
Which of these is the current in component A when the temperature is 80°C? (1)
(ii) Component A is connected to a 12V supply.
Which of these is the current in component A when the temperature is 80°C? (1)
(Total for Question 3 = 9 marks)