Question

Two lamps are separated by a distance R= 3 m. In each lamp one Ampere of current flows. From the definition of an Amp, how many Coulombs of charge per second flows through each lamp? From the definition of a Coulomb, how many electrons per second is that?

Answer 1

Given data

*The given current is I = 1 Ampere

*The given time is t = 1 s

The expression for the charge is given as

`Q=I* t`

Substitute the known values in the above expression as

`\begin{gathered} Q=1*1 \\ =1\text{ C} \end{gathered}`

Hence, 1 Coulomb of charge flows through each lamp

The formula for the number of electrons in one Coulomb of charge is calculated as

`n=(q)/(e)`

*Here e = 1.6 × 10^-19 C is the charge of the electron

Substitute the known values in the above expression as

`\begin{gathered} n=(1)/(1.6*10^(-19)) \\ =6.25*10^(18)\text{ electrons} \end{gathered}`