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It is not possible to answer this question as there is not enough information. The numbers of watts is a measure of the amount of energy being "used" per second. e.g. If a light bulb is rated at 100 watts this means 100 joules of energy are being "used" per second by the bulb. To be able to calculate the number of watts in 7400 volts we also need the current, which is measured in amps. Amps are a measure of the amount charge flowing around an electrical circuit per second. e.g. 13 amps means 13 coulombs of charge are flowing round the circuit per second. A volt can be though of at "the amount of energy in each coulomb" - although this is not the definition a physacist would give you! So multiplying volts and amps will give the number of watts. For example, if your 7400 volts are causing a current of 13 amps to flow, then the power will be: 7400 x 13 = 96200 watts (or 96.2 kW).

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Your question is equivalent to asking 'How many kilometres per hour is 20 metres?'

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