Ohm’s Law states that the current through a metallic conductor is directly proportional to the potential difference across it, if the temperature is constant.
Category: Current of Electricity
Define resistance.
Resistance is the ratio of the potential difference applied to the current flowing through.
Define potential difference.
Potential difference is the work done to drive a unit charge across two points in a circuit.
Define electromotive force.
Electromotive force is the work done by a source in driving a unit charge around a complete circuit.
Define current.
Current is the rate of flow of charges.
Two Resistors Connected to a Battery
Describe the effect of temperature increase on the resistance of a metallic conductor.
The resistance increases as the temperature of a metallic conductor increases, so the resistance is directly proportional to the temperature.
When temperature increases, the amplitude of vibration of atoms increases. As a result, the number of collisions among the electrons and atoms increases, increasing the resistance to the flow of charges through the conductor.