Question

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?

Answer 1

There formula we'll use is V=IR, or I=V/R for convenience.
Now since V chances to V/2, the new value I will be (V/2)/R.
Bringing out 1/2 from V, we get the new value of I=1/2(V/R).
But V/R=old value of I
Therefore the new value of I=old value of I/2
That means the current will fall down to half.

Answer 2

♤ We know that

I = V/R

If V' = V/2

I' = V'/R

= V/2R

= 1/2

Therefore , the current will also become half of its previous value.