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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
it depends on the current going through the resistor as to how much voltage it will drop. usually a voltage divider consisting of two resistors is used.
There are various ways to do it, but you don't give enough details for a complete answer - but a resistor 'could' be used, depending on the exact circumstances.
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