(i) Define the term ‘volt’. (ii) State the relation between work, charge and potential difference for an electric circuit. Calculate the potential difference between the two terminals of a battery if 100 joules of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other. OR (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 is passing through an electric bulb in 20 minutes if the value of current is 200 mA.

Question

Philoid · Accepted Answer

(i) As, V = IR

If, I = 1A and R = 1Ω then, V = 1V

The difference of potential that would carry one ampere of current against one-ohm resistance.

(ii) According to the definition, the potential difference between two points is defined as the amount of work done in moving charge from one point to another.

So, Potential difference =

V =

For, work done = 100J and charge = 20C

V =

=

= 5J

OR

(i) I =

If, I = 1A and t = 1s then, q = 1C.

Coulomb is that amount of electric charge required by one ampere current in unit time.

(ii) I =

For, I is electric current, q is electric charge, and t is time.

Now, I = 200m A and t = 20min

200 × 10^-3 =

0.2 × 1200 = q

240C = q