As others have mentioned, electrons do have some tiny mass. Like, really tiny. Something yet to be mentioned is the correlation of wattage to joules. Wattage represents the electrical ‘work,’ Volts x Amps. Whereas Joules represent physical work. Even though these concepts are somewhat separate, there is enough overlap as to allow for a conversion between Watt and Joule. This insinuates that some form of ‘work’ is done within a given a circuit. Work only occurs from moving/displacing masses.
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