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# Potential divider watch

1. http://www.thestudentroom.co.uk/atta...1&d=1364228860
WHY is a potential divider needed in the circuit? Is it so that the voltage can easily be adjusted? If so, why can't you just use a variable resistor like the one in this link:
https://encrypted-tbn1.gstatic.com/i...7-5Tjqu6AAKBa0
??

Thanks you .
2. Potentiometers are essentially potential dividers, and they can be used as variable resistors. The purpose of a potential divider circuit is to vary the output p.d., which is what you are being asked to do.
3. (Original post by Brister)
Potentiometers are essentially potential dividers, and they can be used as variable resistors. The purpose of a potential divider circuit is to vary the output p.d., which is what you are being asked to do.
But why can't you have a variable resistor instead? The MS mentions nothing about it. Or is it that it's one of the components shown there?
Thanks
4. You may get away with it on an exam, but that is not for me to say. Your teacher should know better than I do. At least for my exam board, we only had to know about the basic potential divider circuit.
5. (Original post by Brister)
You may get away with it on an exam, but that is not for me to say. Your teacher should know better than I do. At least for my exam board, we only had to know about the basic potential divider circuit.
Thank you

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