power of components

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

  Power of electrical components
• What is power in terms of energy transfer?

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

  Watt
• How many Joules are in one Watt?

  One Joule per second
• What does a potential difference of 10 volts indicate across a resistor?

  10 Joules of energy per Coulomb of charge
• What does a current of 1 ampere signify?

  One Coulomb of charge flowing per second
• How can you calculate the power of a component?

  Power = Potential difference × Current
• What is the equation for calculating power?

  Power (W) = Voltage (V) × Current (A)
• Why is it important to learn the power equation?

  It is not provided in the exam
• What is the power of a resistor with a potential difference of 50 volts and a current of 0.2 amp?

  • Power = Voltage × Current
  • Power = 50 V × 0.2 A
  • Power = 10 Watts
• What is the total potential difference across two resistors in series if the total is 20 volts?

  20 volts across both resistors
• How is potential difference shared in series circuits?

  It is divided among the components
• If resistor B has a potential difference of 15 volts, what is the potential difference across resistor A if the total is 20 volts?

  5 volts across resistor A
• What is the power of resistor A with a potential difference of 5 volts and a current of 0.5 amp?

  2.5 Watts
• What is the equation for calculating power using current and resistance?

  Power = Current² × Resistance
• What is the power if the current is 0.4 amp and the resistance is 50 ohms?

  8 Watts
• What are the key equations for calculating power in electrical circuits?

  1. Power = Voltage × Current
  2. Power = Current² × Resistance