Electric resistance

Table of contents

The electrical resistance is the opposition to the motion of the electrons through a conductor. It can be said that conductors have low resistance and insulators have very high resistance. This opposition to electric current depends on the type of material, its cross-sectional area, and its temperature. Resistance serves to limit the amount of current through the circuit with a given amount of voltage supplied by a battery or a generator.

When electrons move against the resistance opposition, friction is generated. Just like mechanical friction, the friction produced by electrons flowing against a resistance manifests itself in the form of heat. The concentrated resistance of a lamp’s filament results in a relatively large amount of heat energy dissipated at that filament. This heat energy is enough to cause the filament to glow white-hot, producing light, whereas the wires connecting the lamp to the battery (which have much lower resistance) hardly even get warm while conducting the same amount of current.

Help us to improve


Leave a Reply

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Explore, Learn and Make a Good Future!