In a circuit, what does an increase in resistance do to the current?

An increase in resistance in a circuit directly affects the current as dictated by Ohm's Law, which states that current (I) is equal to the voltage (V) divided by resistance (R), expressed mathematically as I = V/R. When resistance increases while the voltage remains constant, the current must decrease. This is because a higher resistance opposes the flow of electric charge more, thereby limiting the amount of current that can flow through the circuit. Thus, as resistance increases, the ability for current to navigate through the circuit diminishes, resulting in a decrease in current. This principle is foundational in electrical theory and explains why the correct answer reflects this relationship accurately.