DC Ammeter Shunts

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DC Ammeter Shunts are low resistance precision resistors used to measure electrical currents by the voltage drop those currents create across the resistance.

Power Rating : Watts (W) = Current (I2) x Resistance Value (R)

• The heat produced is power measured in Watts (W).
• Current shunts dissipate heat from the current flowing through them, when they get hot.
• In practice current shunt is often rated to be used continuously at only 2/3 of their "rated current".
• Since that heat can change their resistance and even permanently damage the shunt, so it is often given a power rating or a derating factor.

Calculate Current : Current (I) = Voltage (V) / Resistance Value (R)

• By inserting a current shunt into a circuit to get the current you want to measure while the voltage dropped across the shunt.
• Then knowing the resistance of the current shunt you can calculate the current by using Ohm's law.