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Direct-current circuits
Change of ampermeter measurement range
resistance of shunt necessary to change of ampermeter measurement range from I1 to I2
R
p
=
Ω
x
μΩ
mΩ
Ω
kΩ
MΩ
GΩ
TΩ
internal resistance of ampermeter
R
int
=
Ω
x
μΩ
mΩ
Ω
kΩ
MΩ
GΩ
TΩ
new instrument range
I
2
=
A
x
pA
nA
μA
mA
A
kA
former instrument range
I
1
=
A
x
pA
nA
μA
mA
A
kA
1. Define values of all variables, besides sought quantity
2. Change units if necessary
3. Click "Calculate"
