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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.

Middle

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

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.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

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