Power + energy

• Power


  The rate at which energy is transferred or work is done

  
• P = E/t


  The equation linking power, energy transferred and time

  
• P


  The symbol for power

  
• E


  The symbol for enegy

  
• t


  The symbol for time

  
• Joules (J)


  The SI unit for energy and work

  
• Watts (W)


  The SI unit for power

  
• Seconds (s)


  The SI unit for time
• One watt is equal to

  An energy transfer of one joule per second (1 W = 1 J/s)

  
• E = IVt


  The equation linking energy transferred, potential difference, current and time

  
• I


  The symbol for current

  
• V


  The symbol for potential difference (voltage)

  
• Volts (V)


  The SI unit for potential difference (voltage)

  
• Amps (A)


  The SI unit for current