Question

What is the purpose of a voltage source?

Answer 1

Answer:

B. It increases the potential energy of electrical charges to produce a current.

Explanation:

Battery is a source of constant potential difference

When a charge is passed through the battery then its potential energy changes by

$\Delta U = Q\Delta V$

here we know that

$\Delta V$ = potential difference of battery

so as the charge is passing through the terminals of battery its potential energy is changed by above value.

Now by the conservation of energy principle we know that this change in potential energy will convert into kinetic energy of charge and then the flow of charge will produce current in the circuit.

So battery is used to maintain a constant current in the circuit by giving potential energy to the charge.