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

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Introduction

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

Input variable

Current in circuit

Control Variables

Volume of liquid

Type of liquid

Amount of insulation

Size/shape of beaker

Size/shape of immersion heater

Thermometer used

Time readings are taken over

Start temperature of liquid

Output variable

Temperature change in 5 minutes

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.

Predictions

        I predict that the current in the circuit will be proportional to the temperature change i.e.

...read more.

Middle

Reading

Vol. Of H20

Current (A)

Voltage (V)

Temp. change 1

Temp. change 2

1

75cm3

1.42

3.77

2oC

3oC

2

75cm3

1.76

4.66

10oC

4oC

3

75cm3

2.16

5.67

6oC

8oC

4

...read more.

Conclusion

If we wanted to make sure that no heat was lost at all from our experiment then we would have to do the experiment in a vacuum. This is of course impossible in our case because we do not have the equipment to do this.

If I was to do the experiment again I would try to iron out all of the anomalies in my results by changing and adapting all of the things that affected my results this time round.

...read more.

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