Calculating Energy Transfers by Components

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

  Total energy transferred by components
• What is the relationship between charge flow and energy transferred in a circuit?


  Charge flow indicates energy transfer in circuits
• How do you calculate total charge flowing in a circuit?

  Charge = Current × Time
• What is the current in the example circuit?

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

  3 kC
• What equation is used to calculate energy transferred in a circuit?

  Energy = Charge × Potential difference
• What is the unit of energy transferred?

  Joules
• If 4 kC of charge flows at 15 volts, what is the energy transferred?

  60 J
• What must you calculate first to find energy transferred by resistor A?

  Potential difference across resistor A
• What is the potential difference across the cell in the example?

  30 volts
• How is potential difference shared in series circuits?

  It is shared across components
• What is the potential difference across resistor A if resistor B has 25 volts?

  5 volts
• How do you calculate the energy transferred by resistor A with 3 kC of charge and 5 volts?

  Energy = 3 × 5 = 15 J
• What is the formula for energy transferred in a circuit?

  • Energy (J) = Charge (C) × Potential Difference (V)
• What are the steps to calculate total energy transferred by components?

  1. Calculate total charge using Charge = Current × Time
  2. Use Energy = Charge × Potential Difference
• What are the key concepts in calculating energy transferred in circuits?

  • Current (A)
  • Time (s)
  • Charge (C)
  • Potential Difference (V)
  • Energy (J)