1.1. Fig. 10.1 shows the symbol for an electrical component.

State the name of the component shown in Fig. 10.1.

1.2. The resistance of the component shown in Fig. 10.1 varies with temperature. Fig. 10.2 shows a graph of resistance against temperature for the component.

(i) Use the graph to determine the resistance of the component at a temperature of 10 °C.

resistance = ...................................................... Ω [1]

(ii) At another temperature, the resistance of the component is 800 Ω.

    Calculate the current in the component when it is connected to a 12.0 V supply.

current = ...................................................... A [3]

1.3. The students who built the circuit in part (a) want to change it so that it becomes sensitive to light rather than heat.

State the change the students should make.

1.4. Draw the symbol for the replacement component you suggested in part (c).