What does an increase in resistance do to the current in a circuit?

An increase in resistance in a circuit has a direct impact on the current flowing through that circuit, as described by Ohm's law, which states that current (I) is equal to voltage (V) divided by resistance (R). When resistance increases while the voltage remains constant, the current must decrease. This relationship illustrates that resistance opposes the flow of electric current, leading to lower current levels.

In practical terms, if you were to imagine a water flow analogy, increasing resistance is akin to narrowing the pipe through which water flows. As the pipe becomes narrower (representing increased resistance), less water (representing electric current) can flow through it. Thus, the correct understanding is that escalating resistance in an electrical circuit directly results in a decrease in current.