if we say voltage is work done on a single charge to move it across a circuit, and work is the force applies on a body of a certain mass to move it across a distance, are electric charges in a circuit bodies of mass?
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Yes electrons have mass. But the electromagnetic force does not operate on mass, it operates on charge. Charge is a property, so it cannot have mass. Although particles with charge do have mass (some of them don’t, kinda, see “holes”).
Work is change in potential energy, not just kinetic. So as charged particles move in an electric field, they gain/lose electric potential energy.
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