# Circuits Gcse Worksheet - DOC

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```					GCSE PHYSICS : CHARACTERISTICS OF ELECTRIC COMPONENTS

1. A Filament Lamp
 This will not give the same graph as was obtained in the experiment on Ohm’s law.
 You need to obtain measurements of voltage and current (at least 6 pairs) and enter them in the table below.
Vary the voltage by adjusting the control dial on the power pack. Try and get readings between 0V and
10V.
 Plot a graph of current (vertical axis) against voltage (horizontal axis).
+      -
o     o                               Voltage (V)                    Current (A)

A

V

2. A Diode
 Diodes are not metallic. They are also specially manufactured, so their behaviour is totally different to any
metal.
 Collect at least 6 pairs of readings of V and I.
 Once you have done this, change the current direction through the diode by disconnecting the leads to it and
 Now plot a graph.
Voltage (V)                     Current (A)
+      -
o     o

A

V
3. Thermistors
 Thermistors are made out of semi-conductors. They respond differently to changes in temperature, than
metals. Their properties make them useful in circuits which are used to turn heaters on or off automatically,
as is done in an incubator for example.
 Place the thermistor into each of the water baths. Measure and record the resistance of the thermistor at
different temperatures. Record the reading on the digital resistance meter and the thermometer. Use the
table provided.
 Plot a graph of Resistance v.s. temperature and draw a best fit curve.

Temperature (oC) Resistance (

4. Light Dependent Resistors (LDR)
 These are also made of semi-conductors so behave differently to metals. These devices respond to changes
in light intensity so are useful in circuits which are used to switch on lights automatically at night.
 Record the resistance of the LDR in normal light. Also record the corresponding light intensity using the
light probe.
 Place one of the translucent sheets over the LDR and repeat. Record the light intensity detected by the light
probe with the same number of translucent sheets over it.
 Continue until you have readings using all the translucent sheets of plastic.
 Plot a graph of Resistance vs light intensity and draw a best fit curve.

Number of
Light Intensity    Resistance
translucent
(%)              (
sheets
0
1
2
3
4
5

```
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