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Power Resistors' Features and Applications

Power Resistors' Features and Applications

Power resistors are designed to withstand and dissipate large amounts of power. In general they have apower ratingof at least 5 Watt. They are made from materials with a high thermal conductivity, allowing efficient cooling. They are often designed to be coupled with heat sinks to be able to dissipate the high amount of power. NLR series and MVR series from Microhm Electronics are very popular precision power resistors with heatsink, Nual series is a traditional metal-clad power resistor. Some might even need forced air or li...

Date:2019-08-24      [More+]
Tolerance and Measurement of Resistance at Low Values

Tolerance and Measurement of Resistance at Low Values

The ability to measure low values to tight tolerances is a concern to both the manufacturer and the user. Microhm Electronics low ohm resistors with tight tolerance covering shunt resistosrs, metal foil resistors, metal film resistors and more. The problem is compounded in the cases of high current shunts where the self-heating will cause the in-service resistance value to be different than that obtained with low current level measuring equipment. Therefore, the measurement conditions must be defined at the time of specificat...

Date:2019-08-22      [More+]
4-Terminal Resistors Work Principle

4-Terminal Resistors Work Principle

In a 4-terminal resistor, an ultra-precise resistor (green) is connected to 4 terminals through small, but unknown, resistors (red). These unknown resistors are the combination of lead resistance, screw terminal resistance, connection wire resistance, and other sources of errors. Typical values for these unknown resistors range from 0.01 ohms to 0.2 ohms, and the values are often unstable. The values can change when you loosen or tighten a screw, for example, or if you substitute a longer test lead. To use a 4-terminal resist...

Date:2019-08-22      [More+]
Thin and Thick Film Resistors' Characteristics and Applications

Thin and Thick Film Resistors' Characteristics and Applications

Thin and thick film resistors are the most common types in the market. They are characterized by a resistive layer on a ceramic base. Although their appearance might be very similar, their properties and manufacturing process are very different. The naming originates from the different layer thicknesses. Thin film has a thickness in the order of 0.1 micrometer or smaller, while thick film is around thousands time thicker. However, the main difference is method the resistive film is applied onto the substrate. Thin film resist...

Date:2019-08-20      [More+]
Selecting Right Resistors for Preamp, Amplifier and Other High-End Audio Applications

Selecting Right Resistors for Preamp, Amplifier and Other High-End Audio Applications

In high-end audio equipment, careful selection of resistors is one of the best ways to avoid or minimize noise and distortion in the signal path. Noise is an unwanted wide spectrum signal that may be superimposed on any useful signal, including DC. Resistors, like other passive components, are noise sources to various degrees, depending upon resistance value, temperature, applied voltage, and resistor type. Microhm Electronics manufactures varied resistors, including below mentioned thin film resistors, thick film resistors, ...

Date:2019-08-20      [More+]
Metal Film Resistors Features

Metal Film Resistors Features

Metal film resistors have a thin metal layer as resistive element on a non-conducting body. They are amongst the most common types of axial resistors. Microhms metal film resistors consist of PMRY series, MCC series and more. Other film type resistors are carbon film and thick and thin film resistors. In most literature referrals to metal film, usually it is a cylindrical axial resistor. However, thin film chip resistors use the same manufacturing principle for the metal layer. The appearance of metal film resistors is simila...

Date:2019-08-14      [More+]
Shunt Resistor for Current Measuring in Ammeters

Shunt Resistor for Current Measuring in Ammeters

A device to measure electric current is called an ammeter. Most modern ammeters measure the voltage drop over a precision resistor with a known resistance. The current flow is calculated by using Ohms law: Ohms Law I=V/R. Most ammeters have an inbuilt resistor to measure the current. However, when the current is too high for the ammeter, a different setup is required. The solution is to place the ammeter in parallel with an accurate shunt resistor. Another term that is sometimes used for this type of resistor is ammeter shunt...

Date:2019-08-14      [More+]
Resistors in Electronics and Electrical Projects

Resistors in Electronics and Electrical Projects

There are various basic electrical and electronic components which are commonly found in different circuits of peripherals. In many circuits, these components are used to build the circuit, which are classified into two categories such as active components and passive components. Active components are nothing but the components that supply and control energy. Passive components can be defined as the components that respond to the flow of electrical energy and can dissipates or store energy. These components can be found in nu...

Date:2019-08-13      [More+]
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