Voltage dividers output a fraction of the voltage applied to them. The value of the output voltage depends on how much resistance is between it and the 2 sides of a voltage source.
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- Voltage dividers make poor voltage sources. Use an amplifier, such as a transistor, to boost the power provided by the voltage.
- Equal value fixed resistors connected in series across the power supply, will give you 1/2 of the supply voltage where the resistors connect (output).
- Trimpots and other potentiometers are made specifically to be adjustable voltage dividers. The output voltage will depend on where the wiper is turned to. Turning the wiper adds resistance to one side of the power supply while also reducing resistance to the other side of the power supply.
- Light dependent resistors LDRs have a variable resistance that depends on how much light is falling on them. They are commonly used in place of one of the fixed resistors, to make a light dependent variable voltage divider. Keep in mind that really bright light will bring their resistance to almost zero. So add extra resistance in series if need be.
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