Ammeter Calculator

Calculate shunt resistor values for extending ammeter range and measure current.

Calculation Mode

Rs = Rm / (n - 1)

n = multiplying factor (Imax / Im)

Meter Internal Resistance (ohms)

Full Scale Deflection Current (mA)

Desired Range (A)

5.0005 mohms

Required Shunt Value

Multiplying Factor (n)10000.00x

Meter Current1.000 mA

Shunt Current9.9990 A

Voltage at Full Scale50.00 mV

Power Dissipation499.95 mW

Min Power Rating1000 mW

Recommended Wire14 AWG