Leaving Cert Physics Experiments - All: In an experiment to verify Joule

Question

In an experiment to verify Joule's law, a constant current, I, was passed through a heating coil immersed in water. The current was allowed to flow for 3 minutes and the final temperature θ of the water was then measured.
This was repeated for a number of different currents.

In each case, the initial temperature of the water was 18 °C and the mass of the water was 90 g. The following data were recorded.

I (A)

1.5   2.0   2.5   3.0   3.5   4.5   5.5  
θ (°C)

20.0  22.0  24.0  27.5  30.5  38.0  49.5

Draw a diagram of the apparatus used in this experiment.

Draw a suitable graph to verify Joule's law.

Calculate the slope of the graph and hence calculate the resistance of the heating coil.

(specific heat capacity of water = 4180 J kg⁻¹ K⁻¹)

In an experiment to verify Joule's law, a constant current, I, was passed through a heating coil immersed in water - Leaving Cert Physics - Question 4 - 2018

Worked Solution & Example Answer:In an experiment to verify Joule's law, a constant current, I, was passed through a heating coil immersed in water - Leaving Cert Physics - Question 4 - 2018

Draw a diagram of the apparatus used in this experiment.

Draw a suitable graph to verify Joule's law.

Calculate the slope of the graph and hence calculate the resistance of the heating coil.

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