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Resistance

<^< Voltage and Current | Course Index | Ohm's Law >^>

For any conductor, the current flowing is directly proportional to the e.m.f. applied. The current flowing will also be dependent on the physical dimensions (length and cross-sectional area) and material of which the conductor is composed. The amount of current that will flow in a conductor when a given e.m.f. is applied is inversely proportional to its resistance. Resistance, therefore, may be thought of as an opposition to current flow; the higher the resistance the lower the current that will flow (assuming that the applied e.m.f. remains constant).

High resistance, low current Mid resistance, mid current Low resistance, high current

High Resistance Mid Resistance Low Resistance

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