power of components

• Power


  The rate at which energy is transferred
• Watt


  The unit of power, equal to an energy transfer of 1 Joule per second
• Calculating power in an electrical circuit

  1. Know potential difference across component

  2. Know current flowing through component

  3. Use equation: Power (watts) = Potential Difference (volts) x Current (amperes)
• The equation for calculating power in an electrical circuit is: Power (watts) = Potential Difference (volts) x Current (amperes)
• Calculating power using current and resistance

  1. Know current through component

  2. Know resistance of component

  3. Use equation: Power (watts) = Current^2 (amperes^2) x Resistance (ohms)
• The equation for calculating power using current and resistance is: Power (watts) = Current^2 (amperes^2) x Resistance (ohms)