The Effects of Temperature on Resistance.

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James O'Farrell        Page         5/2/2007

The Effects of Temperature on Resistance


Planning

Aims

To investigate the effects of temperature on resistance.

Background Research

Form background reading and research I have discovered that for most materials that conduct electricity there is some degree of variation of resistance with temperature. There is a set equation governing this change as follows;

Rθ = R0(1+αθ) = R0 + αR0θ

Where

Rθ         = Resistance at Temperature θ

R0         = Resistance at 0°C

α         = The temperature coefficient of resistance.

As we will see after we have done the experiment the temperature coefficient will turn out to be negative as I am sing a N.T.C. Thermistor

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Apparatus

  • Negative temperature coefficient thermistor.
  • Voltage meter (V)
  • Ammeter (A)
  • Power Pack (Low voltage DC)
  • Freezer
  • Heater
  • Beaker
  • Thermometer

Diagram

The Variables

In this section I will look at all the possible variables and decide which ones should be varied in order to obtain results showing the effect of temperature on resistance.

In the circuit above there are several different aspects that can be controlled and hence be variables.

The Voltage: The voltage in this circuit can be changed to an value needed. As only one variable needs ...

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