The relationship between resistance (R), voltage (V), and current (I) in an electrical circuit is governed by Ohm's Law, which states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance of the conductor. The formula for Ohm's Law is I = V/R.

Now, let's consider how a change in resistance affects the current in a circuit:

1. Decrease in Resistance:

- If the resistance in a circuit decreases, the current will increase. This is because there is less opposition to the flow of electrons when resistance is reduced, allowing more current to flow.

- According to Ohm's Law, if the voltage (V) remains constant and the resistance (R) decreases, the current (I) will increase proportionally (I = V/R).

2. Increase in Resistance:

- If the resistance in a circuit increases, the current will decrease. With increased resistance, the opposition to the flow of electrons increases, leading to a reduction in current.

- By Ohm's Law, as the resistance (R) increases while the voltage (V) stays the same, the current (I) decreases (I = V/R).

In summary, a change in resistance in a circuit directly influences the current flowing through it. A decrease in resistance leads to an increase in current, while an increase in resistance leads to a decrease in current. These relationships are fundamental in understanding and analyzing electrical circuits.