Charge in Circuits

• What should you be able to calculate by the end of this video?

  Charge flow in a circuit
• Why is it important to learn about charge flow?

  It is fundamental to understanding electric circuits
• What is the unit of electrical charge?

  Coulombs
• What does a current of 1 ampere represent?

  1 Coulomb of charge flowing per second
• How is the size of electric current defined?

  As the rate of flow of electrical charge
• What is the equation to calculate charge flow in a circuit?

  Charge flow = Current × Time
• Will the charge flow equation be provided in the exam?

  No, you need to learn it
• If the current is 0.3 amperes and the time is 20 seconds, what is the charge flow?

  6 coulombs
• How do you calculate the current if you know the charge flow and time?

  Current = Charge flow / Time
• What is the current if 360 coulombs flows in 400 seconds?

  0.9 amperes
• What is the process to calculate charge flow in a circuit?

  • Identify current in amperes
  • Identify time in seconds
  • Use the equation: Charge flow = Current × Time
• What are the steps to rearrange the charge flow equation to find current?

  1. Start with Charge flow = Current × Time
  2. Rearrange to Current = Charge flow / Time