ZIMSEC O Level Combined Science Notes: Experiment: Ohm’s Law

  • It gives the relationship between potential difference and current through a wire in a circuit
  • According to the law:
  • \text{potential difference}\propto\text{current}
  • The current passing through a wire is proportional to the potential difference across its ends
  • Provided the temperature remains constant
  • An equation can thus be formed:
  • constant\dfrac{\text{potential difference(V)}}{\text{current (I)}}
  • Resistance-is the constant
  • It is a measure of how difficult it is for a current to flow through the given wire
  • It is measured in ohms
  • The symbol Ω is used to represent ohms
  • Ohms law can be expressed as:
  • \text{R =}\dfrac{V}{I}
  • V is voltage
  • I is current
  • R resistance
  • By substituting the formula the equation can be used to find unknown variables where two of the variables are known

To access more topics go to the Combined Science Notes page.

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