Sähkövastukset

Sähkövastukset, also known as resistors, are passive electrical components that are used to control the flow of electrical current in a circuit. They are designed to have a specific resistance value, which is measured in ohms (Ω). Resistors are commonly used in various electronic circuits to limit current, divide voltages, and to bias transistors and other active components.

Resistors are typically made from materials with high electrical resistance, such as carbon, metal alloys, or semiconductors. They come in various shapes and sizes, including axial-lead, radial-lead, and surface-mount types. The resistance value of a resistor is usually indicated by color bands or a numeric code printed on the body of the component.

Resistors can be categorized into different types based on their construction and application. Fixed resistors have a constant resistance value and are used in applications where the resistance does not need to be adjusted. Variable resistors, also known as potentiometers, have an adjustable resistance value and are used in applications where the resistance needs to be changed, such as in volume controls or dimmer switches.

Resistors play a crucial role in electronic circuits by controlling the flow of electrical current and ensuring that components receive the correct amount of power. They are essential in a wide range of applications, from simple circuits to complex electronic systems.