Resistance
Resistance is a measure of how much a material opposes the flow of electric current.
It determines how easily electrons can move through a conductor.
Resistance is defined by the equation:
$$R = \frac{V}{I}$$
where:
If a potential difference of 12 V is applied across a resistor and a current of 2 A flows through it, the resistance is:
$$R = \frac{12 \, \text{V}}{2 \, \text{A}} = 6 \, \Omega$$
Ohm's law
Ohm’s Law states that the current through a conductor is directly proportional to the potential difference across it, provided the temperature remains constant.
For ohmic materials (those that obey Ohm’s Law), the resistance remains constant regardless of the current or voltage.
A graph of current (I) versus voltage (V) for an ohmic material is a straight line through the origin, indicating constant resistance.
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Ohm's Law
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