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"Volt" is a unit of potential difference. "Joule" is a unit of energy. There is

no direct conversion from one to the other.

-- If a 2-ohm resistor is connected to a 5-volt battery, then the current

through the resistor is volts/ohms = 2.5 amperes.

-- The power supplied by the battery and dissipated by the resistor is

(volts) x (current) = 12.5 watts.

-- "12.5 watts" means "12.5 joules of energy every second".

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At 12 volts how many watts is 30 amps?

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