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watts is a unit of power. joule is a unit of energy.

The relationship between energy and power is:

Power = Energy / Time. And 1 watt = 1 joule / second

So you need to know how much time it took to deliver/transfer that 2400 joules of energy.

If for example it took 1 sec, then you have 2400 w. If it took 1 minute (60 sec)

Then Power = 2400 J / 60 sec = 40 w

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