(a) The figure below shows the scale of an ammeter. Draw the position of the pointer when the ammeter reading is 0.35 A.
(b) The ammeter was used in the circuit shown below to investigate the current in a lamp.
(i) Name the component labelled Y.
(ii) The table shows the current I in the lamp for different values of the p.d. V across the lamp.
1. Calculate the values of the resistance R of the lamp, using the equation
Write your answers in the table.
2. Complete the column headings in the table.
(iii) Suggest how the value of V could be varied.
(c) Figure below shows a power source connected to three resistors labelled X, Y and Z.
Complete the diagram to show
(i) a voltmeter connected to measure the voltage across the resistors,
(ii) an ammeter connected to measure the current in resistor X only,
(iii) connecting wires to complete the circuit.