Power of Components

• What is the definition of power in the context of energy transfer?

  Power is the rate at which energy is transferred
• What is the unit of power?

  The unit of power is the Watt
• How is one Watt defined in terms of energy transfer?

  One Watt is an energy transfer of one Joule per second
• What does a potential difference of 10 volts indicate across a resistor?

  It indicates that 10 Joules of energy are transferred per Coulomb of charge
• What does a current of 1 ampere tell us in terms of charge flow?

  It tells us that one Coulomb of charge is flowing every second
• How can you calculate the power of an electrical component?

  Power in watts equals potential difference in volts multiplied by current in amps
• What is the equation to calculate power in electrical circuits?

  Power = Voltage × Current
• What is the formula for calculating power using potential difference and current?

  • Power (P) = Voltage (V) × Current (I)
  • Units: P in Watts, V in Volts, I in Amperes
• If the potential difference across a resistor is 50 volts and the current is 0.2 amp, what is the power?

  The power is 10 Watts
• In a series circuit with a total potential difference of 20 volts and resistor B having a potential difference of 15 volts, what is the potential difference across resistor A?


  The potential difference across resistor A is 5 volts
• If the current in the circuit is 0.5 amp and the potential difference across resistor A is 5 volts, what is the power of resistor A?

  The power of resistor A is 2.5 Watts
• What is the equation to calculate power if you know the current and resistance?

  Power equals current squared multiplied by resistance
• If the current is 0.4 amp and the resistance is 50 ohms, what is the power?

  The power is 8 Watts
• What are the two equations for calculating power in electrical components?

  1. Power = Voltage × Current
  2. Power = Current² × Resistance
• Where can you find more questions on calculating power in circuits?

  • In the vision workbook available through the provided link
• Why is it important to learn the power equations for exams?

  Because they are not provided in the exam
• What is energy transfer in the context of electrical circuits?

  Energy transfer is the movement of energy through electrical circuits
• How do potential differences behave in series circuits?

  Potential differences are shared between components in series
• What are the units used in power calculations?

  Watt, Joule, Ampere, Volt, Ohm