A Thermistor has low resistance.

a) Draw the circuit symbol for a thermistor.

b) Give one use for a thermistor.

c) Explain why a thermistor is suitable for this use.

Thermistor has a resistance of ________

A student connects a circuit with an NTC thermistor, a filament lamp and a battery in series. The lamp glows dimly. The student warms the thermistor with a hair dryer. What change will the student notice in the brightness of the lamp? Explain your answer

The graph in Figure was obtained by measuring the resistance $R$ of a particular thermistor as its temperature changed.

Determine its resistance at: $20°C$

The graph in Figure was obtained by measuring the resistance R of a particular thermistor as its temperature e changed Determine the temperature when its resistance is: $5000\Omega$.

The resistance of a metal wire changes with temperature. This means that a wire could be used to sense changes in temperature, in the same way that a thermistor is used 

 Suggest one advantage a thermistor has over a metal wire for this purpose.

Design a circuit using the thermistor in Figure that uses a cell of $10 \mathrm{V}$ and produces an output voltage of $5 \mathrm{V}$ at $50°\mathrm{C}$. Explain whether the voltage output of your circuit increases or decreases as the temperature rises.

Variation of resistance with temperature.

This is a circuit.

Which line in the table shows the changes to the lamp and the voltmeter reading when the temperature rises?

The graph in Figure was obtained by measuring the resistance R of a particular thermistor as its temperature e changed. Determine its resistance at: $45°C$.

Thermistors have? 

A student connects a NTC thermistor to a battery and an ammeter. He places the thermistor in a beaker of water and gradually heats the water from 10 oc to its boiling point, recording the value of the current as he does so. He then plots a graph of the current in the thermistor against the temperature of the water Explain how the student could now use the thermistor as a thermometer. 

The resistance of a metal wire changes with temperature. This means that a wire could be used to sense changes in temperature, in the same way that a thermistor is used.

Suggest one advantage a metal wire has over a thermistor.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

The graph in Figure was obtained by measuring the resistance R of a particular thermistor as its temperature e changed. Determine the temperature when its resistance is:$2000\Omega$.