Calculating Energy Transfer by Components

• How do you calculate the total charge flowing in a circuit?

  Charge in coulombs equals current in amperes multiplied by time in seconds
• What should you be able to calculate by the end of the video?

  The total energy transferred by components
• What was the current in the circuit example given?

  0.3 amp
• What is the total charge flowing in 10 seconds with a current of 0.3 amp?

  3 coulombs
• What happens whenever charge flows in a circuit?

  Work is done, meaning energy is transferred
• What is the equation to calculate energy transferred?

  Energy transferred in joules equals charge flow in coulombs multiplied by potential difference in volts
• Is the energy transferred equation provided in the exam?

  No, you need to learn it
• If 4 coulombs of charge flows in a circuit with a potential difference of 15 volts, what is the total energy transferred?

  60 joules
• How do you calculate the energy transferred if 3 coulombs of charge flows through resistor A?

  Multiply the charge flow by the potential difference across resistor A
• What is the potential difference across resistor A if the total potential difference is 30 volts and resistor B has a potential difference of 25 volts?


  5 volts
• What is the energy transferred by resistor A if 3 coulombs of charge flows through it with a potential difference of 5 volts?

  15 joules
• What is the relationship between charge flow and energy transfer in a circuit?

  • Charge flow in coulombs
  • Energy transferred in joules
  • Potential difference in volts
  • Energy transferred = Charge flow × Potential difference
• What are the steps to calculate total energy transferred in a circuit?

  1. Identify the charge flow in coulombs
  2. Identify the potential difference in volts
  3. Use the equation: Energy transferred = Charge flow × Potential difference
• What resources are available for more practice on calculating energy transferred?

  • Vision workbook
  • Additional questions available through the provided link