what do resistors do

A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. When a resistor is added in series with a circuit, it reduces the current in the circuit. This allows the designer to control the currents and voltages in the circuit, providing the necessary conditions for the components to function properly. Resistors are made from materials like copper, carbon, or nichrome wire, and they can come in various types such as carbon-composition resistors, film resistors, and wirewound resistors. They can handle higher currents and protect components against voltage spikes, making them essential in electrical circuits. In a direct-current (DC) circuit, the current through a resistor is inversely proportional to its resistance, and directly proportional to the voltage across it, following Ohms Law. In alternating-current (AC) circuits, this rule applies as long as the resistor does not contain inductance or capacitance. Essentially, resistors play a crucial role in controlling and regulating the flow of electrical current in electronic circuits, ensuring that the components function as intended.