In a direct current circuit with 100 volts and 5 amps supplying a 500-watt bulb, the current indicates that 5 coulombs of charge are transferred per second. Given that one coulomb contains approximately 6.242 x 10^18 electrons, about 3.121 x 10^19 electrons are moving each second. The mass of an electron is approximately 9.11 x 10^-31 kg, leading to a total mass of about 2.84 x 10^-11 kg of electrons in motion per second. The speed of electrons in the wire can be calculated using drift velocity, but the discussion assumes negligible resistance. The calculations demonstrate the relationship between current, charge, and mass in an electrical circuit.
