Question

(i) Define the term coulomb. (ii) State the relationship between electric current, the charge moving through a conductor and the time of flow. (iii) Calculate the charge passing through an electric bulb in 20min if the value of current is 200 mA

Answer 1

Dear student,
(i)The term coulomb is the SI unit used to measure the electric charge. It is defined as the charge transported by the constant value of the current of one ampere in one second. It is denoted by the symbol is C.
1C=1A. 1s

(ii)The relationship between the electric current, the charge moving through a conductor and the time of flow is
I(Electric current)=Q(charge)/t(time flow)

(iii)Q=It
Q=200x10^-3 x 1200 (10-3 because the current is in mA and 1200 because time is in minutes, so converted into seconds 20x60=1200s)
Q=240C