In what way do resistors affect an electrical circuit?

Resistors play a critical role in electrical circuits by controlling and limiting the flow of current. When a resistor is introduced into a circuit, it provides resistance, which opposes the movement of electrical charge. This opposition results in a decrease in current flowing through the circuit according to Ohm's Law (V = IR), where voltage (V) is equal to current (I) multiplied by resistance (R). Hence, by increasing the resistance in a circuit, resistors effectively reduce the rate at which current can flow.

This characteristic allows engineers and technicians to design circuits in a way that protects sensitive components, balances loads, and controls power distribution, ensuring that each part of the circuit operates within its safe and functional limits.