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03 – Resistor

The picture shows a sketch of a Resistor on the left and the symbol on the right. A second symbol for a Resistor used in mostly the USA and Japan is displayed in the bottom picture.

A resistor is a component that adds electrical resistance to a circuit by making it more difficult for electricity to flow through it. Various types of resistors exist such as wire wound, carbon and film. Resistors come in various ranges such as the 1%, 5% or 10% ranges. For a Resistor in the 5% range the value of the resistor can vary + or – 5%. Each range has a different set of resistors values based on the percentage ratings.

There a couple of functions for resistors in electronics, here are a few examples:

  1. Limiting the current in a circuit to protect other components like LED’s.
  2. Potential dividers.
  3. RC Filter applications.