Question

what is sensor???
how to make it with simple available things ​

Answer 1

Explanation:

A sensor is a device which detects or measures a physical property and records, indicates, or otherwise responds to it.

A transistor, a resistor and an LED. Connect the resistor and LED in series from the positive supply to the collector of the transistor. Connect the emitter of the transistor to the negative terminal of the supply. Now, create two wires with exposed ends – so you can see the metal.

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Answer 2

Answer:

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