A 500 ohm resistor is a specialised electronic component designed to generate a fixed amount of resistance when installed in a circuit. Designed to provide a consistent resistance value throughout a broad variety of temperatures and humidity levels, they are often made of metal wire or carbon.
The level of electrical resistance in a variable resistor can be changed by turning a shaft or adjusting a lever. According to Ohm’s law, the resistance R is the constant of proportionality between the voltage V across a resistor and the current I through it.
High-frequency applications can benefit from the practical resistor’s series inductance and low parallel capacitance. The resistor’s noise characteristics could be problematic in a low-noise amplifier or pre-amp. The resistance’s temperature coefficient may also be an issue in high-precision contexts.
Leads on through-hole parts often extend out of the body “axially,” or along a plane perpendicular to the longest axis of the component. Some people have “radial” leads going out of their bodies, while others don’t. High power resistors may have one of its leads integrated into the heat sink, while other parts may make use of surface mount technology.
Chemical Makeup of Carbon
Carbon composition resistors (CCRs) are a type of resistor that are made of a solid cylindrical element with wire leads embedded inside it or metal end caps to which the leads are attached. Resistor housings are typically coated in plastic or paint for durability.
Need of 500 ohms Resistor
Carbon composition resistors were used in the early 20th century, and their uninsulated bodies required the lead wires to be wrapped around the resistance element rod. Finally, the resistor was given a coat of paint to indicate its value.
In a carbon pile resistor, carbon discs are stacked and crushed between metal contact plates. Altering the clamping force alters the resistance between the plates. These resistors come particularly handy when testing things like car batteries or radio transmitters, when a changeable load is necessary.
Carbon film resistors are made by depositing a thin layer of carbon on an insulating substrate and then cutting a helix into the film to create a long, skinny resistive channel. Amorphous carbon’s resistivity combined with the form diversity can produce a wide variety of resistance values.
A grid resistor is a massive lattice of stamped metal alloy strips connected in rows that is cooled by convection used in high-current industrial applications. Some versions of these industrial grade resistors can take currents of over 500 amps, and the range of resistances extends down to as low as 0.04 ohms.
An ohmmeter (or possibly one of the functions of a multimeter) is used to determine the resistance of a circuit component. The resistor is typically connected to test leads via the probes at the ends of the leads. Applying battery voltage across the unknown resistor generates a current that powers the meter’s movement in a simple ohmmeter.