Shunt

A shunt is simply a resistor. When current flows through the resistor, a voltage will build up over the resistor as described by Ohms Law ; U=R*I, so the voltage over the resistor is equal to the resistance in Ohms multiplied with the current in Amperes.

 

The voltage is easily measured, and knowing the resistance the current can be calculated.

 

The shunt can be a very accurate way to measure current, but it also adds some loss in the circuit and depending on where the shunt is inserted, isolation may be required between the metering equipment, the ezeio and the circuit.

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