Define the term ‘coulomb’. State the relationship between the electric current, the charge moving through a conductor and the time of flow.

Question

(i) Define the term ‘coulomb’. 

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

Answer 1

(i) The charge possessed by the body is said to be 1 coulomb, if 1 joule of work is done in moving a charged body across two points having a potential difference of 1 volt. 

(ii) Electric current is the rate of flow of electric charge. If Q coulombs of charge flows through a conductor in time t seconds, then the current I is