An Ohmic conductor is a type of material where the current flowing through it is directly proportional to the voltage across it, as long as the temperature stays the same. This means that if you double the voltage, the current also doubles, following Ohm's Law, which can be written as:
V=IR
Where:
V is the voltage (or potential difference), measured in volts (V)
I is the current, measured in amperes (A)
R is the resistance, measured in ohms (Ω)
Common examples of Ohmic conductors are metals like copper and aluminium, which have a constant resistance when the temperature does not change. In graphs, the relationship between current and voltage for an Ohmic conductor appears as a straight line passing through the origin.
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