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Understanding Ohm's Law and Resistor Behaviour

Electricity and circuits • Current, voltage, and resistance

Key concepts

What you'll likely be quizzed about

  • Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points.
  • The relationship is defined mathematically as V = I × R, where R is the resistance.
  • This law applies to ohmic materials, which maintain a constant resistance regardless of the applied voltage.
  • In practical terms, this means that as voltage increases, current also increases linearly.

Flashcards

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What defines non-ohmic materials?

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Non-ohmic materials do not have a constant resistance, meaning voltage and current are not linearly related.

Key notes

Important points to keep in mind

Ohm's Law: V = I × R is fundamental.

In series, total resistance increases linearly.

In parallel, total resistance decreases.

Resistor behavior differs between ohmic and non-ohmic materials.

Power analysis (P = V × I) is crucial in circuits.

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