A voltmeter connected to a light bulb shows 3 V how much electron must pass through the coil of a light bulb
| September 19, 2021 | education
A voltmeter connected to a light bulb shows 3 V how much electron must pass through the coil of a light bulb in order to work in 24 Joules? the charge of one electron is -1.6 * 10-29CL
The work of the electric current to move the charge is equal to the product of the voltage U and the charge q:
A = Uq;
q = A / U.
The number of electrons N is equal to the charge q divided by the electron charge e:
N = q / e = A / eU = 24 J / (1.6 * 10 ^ -19 C * 3 V) = 5 * 10 ^ 19.
Answer: 5 * 10 ^ 19 electrons must pass through the spiral of the light bulb.
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