To see the effect of volume current on the effectiveness of an immersion heater heating 75 cm3 of water.

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The immersion heater experiment

Aim – To see the effect of volume current on the effectiveness of an immersion heater heating 75 cm3 of water.

Apparatus: -

Immersion Heater

Small Beaker

Variable resistor

Ammeter

Voltmeter

Thermometer

Power pack

Variables

Method

        A small beaker was filled with 75cm3 of water at 24 degrees Celsius. A circuit was made that incorporated an immersion heater, an ammeter, a voltmeter, and a variable resistor.

The immersion heater was placed into the beaker of water and the current was set to maximum on the resistor. Two readings were taken for each set of results.

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Predictions

        I predict that the current in the circuit will be proportional to the temperature change i.e. as the current is increased the temperature change will increase as well. This is because if the current increases there will therefore be more heat energy lost from the immersion heater.

Results

Analysis.

        As I assumed my predictions have been proved correct. As the current increases, the temperature change in the water increases as well. This is because as more electrical energy flows through the circuit, the immersion heater produces more useful heat energy. This produces a convection current in the ...

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