Physical and Theoretical ChemistryOther Spectroscopy |
What is electrical resistance? |
Electrical resistance describes how a material opposes an electric current through the material. The resistance is related to the applied voltage through the relationship:
where V is the applied voltage and I is the current through the material. Typically the resistance is a constant, and thus the current will increase linearly with an increase in the applied voltage. This relationship is Ohmâ€™s law. As you can see, a material with a higher resistance (R) will have a lower current (I) for a given applied voltage (V).