1.1. Draw the circuit symbol for a light-dependent resistor (LDR).

1.2. A student is designing an experiment to investigate the resistance of light dependent resistors.

This is the method the student has proposed.

1. Set up a circuit with a cell, an analogue ammeter, and an LDR in series, with an analogue voltmeter in parallel across the LDR

2. In a dark room, place a lamp 100 cm away from the LDR and turn it on

3. Measure the readings of current and potential difference

4. Move the lamp to 80 cm away and measure the current and potential difference

5. Repeat at 60 cm, 40 cm, 20 cm, and 0 cm

Suggest two improvements that the student could make and explain how the suggestions would improve the data collected.

1.3. Sketch the shape you would expect an IV graph to be for LDR.

1.4. Explain how the shape of the graph shows that the LDR is a non-ohmic conductor.