A student examines an electric circuit. Fig. 9.1 depicts the student’s setup. The battery carries the label 6.0 V, and the circuit contains a variable resistor, a heater, and an ammeter.
(a(i))[1]
Describe the function of the variable resistor in Fig. 9.1.
(a(ii))[1]
Determine how many cells are needed for the 6.0 V battery in Fig. 9.1.
(a(iii))[2]
On Fig. 9.1, draw the electrical symbol and show how this component is connected.
(b)[3]
Calculate the amount of electrical energy transferred by the heater in 40 s.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “to alter / control current OR p.d./voltage across heater” …