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A designer is going to use a thermistor in a temperature gauge - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1
Question 3
A designer is going to use a thermistor in a temperature gauge. He connects the thermistor into this circuit. He heats the thermistor and measures the current at di... show full transcript
Worked Solution & Example Answer:A designer is going to use a thermistor in a temperature gauge - Edexcel - GCSE Physics - Question 3 - 2013 - Paper 1
Step 1
Plot this value on the graph.
Answer
To plot the current of 0.138 A at 47 °C on the graph, first locate the x-axis, which represents temperature in °C. Move along the 47 °C mark on the x-axis, then go up to the corresponding current value of 0.138 A. Mark this point on the graph as an 'X' and ensure it is represented accurately, using a small square as a reference.
Step 2
Draw the curve of best fit through the points.
Answer
Using a smooth curve, connect most of the plotted points (at least 5) to show the trend in the data. Ensure that the curve has a natural flow through the points, avoiding sharp angles or excessive training that does not represent the data accurately. The curve should not be drawn past the given data points, especially after 45 °C.