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Learn Arduino Prototyping in 10 days by Kallol Bosu Roy Choudhuri

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Rationale for using a resistor

Resistors are commonly used to reduce the amount of current flowing from the source to the destination. To draw up an analogy, it is like squeezing a water supply tube at a particular point thus reducing the flow of water. Similarly, by placing a resistor across a piece of wire, the flow of current gets reduced.

Use a resistor to reduce the flow of the current in a circuit, in order to protect a delicate electronic component that cannot tolerate high currents.

The rule of thumb is to apply a resistor of an appropriate value, in series just before a delicate electronic component that cannot withstand too much current, for example an LED. We will look at an example of this fundamental concept in the following ...

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