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logic

How do I convert watts to amps and amps to watts?

How do I convert watts to amps and amps to watts?

  1. logic
    Contributed by: TieDown

    The formula for converting Watts to Amps is : Watts = Amps * Volts

    The formula for converting Amps to Watts is : Amps = Watts / Volts

    SAFTEY WARNING : Only use 80% of the circuit breaker capacity!

    Common Conversions North American and other 110 volt countries

    Lights :
    1000W / 110V = 9.1A
    600W / 110V = 5.4A
    400W / 110V = 3.6A
    250W / 110V = 2.3A

    Circuits :
    10A * 110V = 1100W and 80% safe usage is 880W
    15A * 110V = 1650W and 80% safe usage is 1320W
    25A * 110V = 2750W and 80% safe usage is 2200W
    30A * 110V = 3300W and 80% safe usage is 2640W

    Common Conversions British Commonwealth and other 240 volt countries

    Lights :
    1000W / 240V = 4.1A
    600W / 240V = 2.5A
    400W / 240V = 1.7A
    250W / 240V = 1.1A

    Circuits :
    10A * 240V = 2400W and 80% safe usage is 1920W
    15A * 240V = 3600W and 80% safe usage is 2880W
    25A * 240V = 6000W and 80% safe usage is 4800W
    30A * 240V = 7200W and 80% safe usage is 5760W

    Remember that a circuit services more than one power outlet.
    A two outlet wall plug will use only one circuit.
    There will be more outlets on 240V systems per circuit than there will be in 110V systems.