Charge in circuits

• Electric charge


  Measured in coulombs (C)
• Current of 1 ampere

  1 Coulomb of charge flowing per second
• Electric current


  The rate of flow of electrical charge
• Calculating charge flow in a circuit

  Charge flow (C) = Current (A) x Time (s)
• The equation for charge flow is not given in the exam, so it must be learned
• Calculating charge flow


  • Current = 0.3 A, Time = 20 s, Charge flow = 6 C
• Calculating current in a circuit

  Current (A) = Charge flow (C) / Time (s)
• Calculating current


  • Charge flow = 360 C, Time = 400 s, Current = 0.9 A
• More questions on calculating charge flow can be found in the revision workbook