How to read a Resistor? 3 & 4 Bands

A resistor is a passive two-terminal electrical component that introduces electrical resistance to a circuit. They reduce current flow, adjust signals, divide voltages, and more. Resistors dissipate electrical power as heat, with resistance measured in ohms according to Ohm’s law.

Resistors are ubiquitous in modern electronics, and critical components in just about every electrical device. Because their primary purpose is to limit current, and the type, size and materials used to describe the resistor play an important role in how the resistor behaves in the circuit. Larger resistors can dissipate more power as heat and withstand high temperatures, suitable for high-power applications like motor braking and power transmission. Smaller resistors with a metal foil design limit less current but provide the highest degree of precision and stability, making them more useful in sensitive circuits that are susceptible to excess noise.

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With respect to the usage, installation or assembly of any products described in this video, Galco Industrial Electronics, Inc., a Michigan corporation, encourages you to follow the requirements and/or guidelines of: i) the Occupational Safety and Health Act of 1970, Public Law 91-596, as amended, and all laws, rules and regulations implemented in relation thereto; ii) the National Electric Code®; and iii) NFPA 70E®. Any installation, assembly or work described in this video should be performed by a qualified licensed electrician.
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