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Potential Dividers

Potential Dividers consist of a pair of resistors. They divide the potential in a circuit so you can get outputs of different voltages.

The higher the resistance, the greater the voltage drop
- A Voltage across a pair of resistors is 'shared out' according to their relative resistances.
- The rule is: The larger the share of the total resistance, the larger the share of the total voltage
- The point between the two resistors is the 'output' of the potential divider.
- This 'output' voltage can be varied by swapping one of the resistors for a variable resistor
Potential Dividers are quite useful
- Potential Dividers allow you to run a device that requires a certain voltage from a battery of a different voltage.
- This is the formula you'll need to use
A Thermistor in a Potential Divider makes a Temperature sensor
- Using a thermistor and a variable resistor in a potential divider, you can make a temperature sensor that triggers an output device at a temperature you choose
- You can make a temperature sensor that gives you a high voltage output when it's hot and a low voltage output when it's cold.
  - This is how it works:
  - When the thermistor's cold its resistance is very high, so the voltage drop across it is almost 5V, meaning the voltage of the output is nearly 0V
  - As the temperature of the thermistor increases, its resistance falls dramatically. So the voltage across it is almost 0V and the voltage of the output is nearly 5V.

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Potential Dividers

Potential Dividers consist of a pair of resistors. They divide the potential in a circuit so you can get outputs of different voltages.

The higher the resistance, the greater the voltage drop

A Voltage across a pair of resistors is 'shared out' according to their relative resistances.

The rule is: The larger the share of the total resistance, the larger the share of the total voltage

The point between the two resistors is the 'output' of the potential divider.

This 'output' voltage can be varied by swapping one of the resistors for a variable resistor

Potential Dividers are quite useful

Potential Dividers allow you to run a device that requires a certain voltage from a battery of a different voltage.

This is the formula you'll need to use

A Thermistor in a Potential Divider makes a Temperature sensor

Using a thermistor and a variable resistor in a potential divider, you can make a temperature sensor that triggers an output device at a temperature you choose

You can make a temperature sensor that gives you a high voltage output when it's hot and a low voltage output when it's cold.