GCSE Physics (AQA)

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Calculating Electric Current

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Electricity Current, potential difference and resistance

Calculating Electric Current

2:48 Circutis, Charge and Current
Spec 4.2.1.2
Previous Current Flow in a Wire Next Potential Difference
  • Electric current is measured as the rate of flow of charge.
  • Equation: Current (I) = Charge (Q) / Time (T).
  • Time is measured in seconds, charge in klos, and current in amps.
  • 1 amp is the current that transfers 1 klo of charge in 1 second.
  • Equations are provided in exams; understanding usage and units is key.
  • Example 1: Calculate current for a lamp with 64 klos of charge in 16 seconds.
  • Current = 64 klos / 16 seconds = 4 amps.
  • Example 2: Calculate charge for a 12 amp current through a resistor in 5 seconds.
  • Charge = Current x Time = 12 amps x 5 seconds = 60 klos.
  • Importance of checking units to avoid losing marks.

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