Current Sense Resistor Definition

October 23, 2019

The resistor may be located in the circuit or in the meter. A current sense resistor is a resistor used to sense the current in a circuit and is usually a low value and may be a 4 terminal resistor.

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A resistor is a passive two terminal electrical component that implements electrical resistance as a circuit element.

Current sense resistor definition. It senses the current that is coming from the power source and flowing into the object that needs it to function. At these low values even the resistance of the ohmic contacts of the sensing circuitry is a factor in the calculations. Current sense resistors are very low value resistors used to measure the current flowing through it.

Even 1 mw and lower resistors are standard catalog offerings fig. Mouser is an authorized distributor for many current sense resistor manufacturers including bourns irc koa ohmite panasonic susumu yageo vishay many more. A current sense resistor helps measure the amount of current that is flowing in a electrical system.

This 02 mw current sense resistor handles up to 200 a and can dissipate 15 w. The current through the resistor is represented by the voltage across the resistor so by applying i vr as set down by the famous school teacher georg simon ohm the current is proportional to the voltage across the resistor. Between the positive supply and the load or between the load and ground.

The voltage across the sense resistor is proportional to the current that is being measured and an amplifier produces a voltage or current that drives the measurement. Sense resistors are widely available in these small values. Current sense resistors are available at mouser electronics from industry leading manufacturers.

A resistor placed in a current path to allow the current to be measured. These products are available in through hole smd or chassis mounted assemblies. Direct current sensing with low ohmic resistors is based on ohms law eir and is accomplished by placing a resistor in series with the system circuitry that needs to be measured often called a shunt resistor a voltage is generated across the shunt resistor that is proportional to the load current.

In electronic circuits resistors are used to reduce current flow adjust signal levels to divide voltages bias active elements and terminate transmission lines among other uses. A resistor can moderate the amount of current so that it doesnt damage the receiving object. High side and low side current sensing refers to the placement of the current sense resistor.

It senses current by converting it to a low value voltage which is read by a voltmeter. Vishay current sense resistors include high power wirewound devices power metal strip resistors with ultra low resistance values and devices built on thick film technologies.