Electronics components

Having understood the basic laws of electronics, this section introduces you to the basic electronics components that are used in most of the electronics circuits.

Resistors

A resistor is a passive two-terminal electrical component that resists the flow of electrons as a circuit element. The current through a resistor is in direct proportion to the voltage across the resistor's terminals. This relationship is represented by an alternative representation of Ohm's law, which yields the current I as the ratio of the potential difference V to the resistance R:

I= V/R

The symbol used for a resistor in a circuit diagram varies from standard to standard and one country to another:

In the real world, a typical axial lead carbon resistor ...

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