Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value

Question 3:

Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

Solution:

According to Ohm’s law

V = IR

⇒ I=V/R ---------- (1)

Now Potential difference is decreased to half

∴ New potential difference Vʹ=V/2

Resistance remains constant

So the new current Iʹ = Vʹ/R

                                    = (V/2)/R

                                    = (1/2) (V/R)

                                    = (1/2) I = I/2