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AQA GCSE · Question 05.4 · Electricity
Figure 8 shows part of a different circuit that is used to monitor the temperature inside the vending machine. The circuit symbol for a thermistor has not been included.
Draw the circuit symbol for a thermistor in the box below.
Figure 8 shows part of a different circuit that is used to monitor the temperature inside the vending machine. The circuit symbol for a thermistor has not been included.
Draw the circuit symbol for a thermistor in the box below.
How to approach this question
Recall the standard circuit symbols. A thermistor is a type of resistor whose resistance changes with temperature. Its symbol is based on the symbol for a resistor (a rectangle) with an additional feature to indicate its temperature-dependent nature.
Full Answer
The circuit symbol for a thermistor is a rectangle (representing a resistor) with a diagonal line passing through it. This line often has a small horizontal bar at its end, which signifies that its resistance is dependent on temperature (the 'T' for temperature is implied by the shape).
Common mistakes
✗ Drawing the symbol for a different component, like an LDR or a variable resistor.
✗ Drawing the resistor symbol without the diagonal line.
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