大象传媒

Resistance

There is a to the flow of an electric through most .

The resistance in a wire increases as:

  • the length of the wire increases
  • the thickness of the wire decreases

An electric current flows when move through a conductor, such as a metal wire. The moving electrons can collide with the in the metal. This makes it more difficult for the current to flow, and causes resistance.

Resistance is best summarised as a measure of a component鈥檚 opposition to .