### Membrane current scaling

Posted:

**Thu Sep 01, 2016 6:28 am**Dear all,

this question has already been answered, but I did not understand the answer. Maybe I am too bad at adding single digit numbers. (Sorry Ted, you answered here already viewtopic.php?f=15&t=2931&p=11969&hilit ... rea#p11969 .)

Following this table https://www.neuron.yale.edu/neuron/stat ... chart.html

the membrane current density has a unit of mA/cm^2 = E-3 A / E-4 m^2 = E1 A/m^2

the area of a segment has an area of um^2 = E-12 m^2

when I multiply those, I get E1 A/m^2 * E-12 m^2 = E-11 A

so to obtain the current in nA (E-9), I would multiply this with E2, meaning a multiplication by a factor of 100.

In previous code and posts here, I saw a factor of 1/100. This would be obtained, if one took cm^2 as E-2 m^2 and um^2 as E-6 m, ignoring that it's squared?

Thanks!

this question has already been answered, but I did not understand the answer. Maybe I am too bad at adding single digit numbers. (Sorry Ted, you answered here already viewtopic.php?f=15&t=2931&p=11969&hilit ... rea#p11969 .)

Following this table https://www.neuron.yale.edu/neuron/stat ... chart.html

the membrane current density has a unit of mA/cm^2 = E-3 A / E-4 m^2 = E1 A/m^2

the area of a segment has an area of um^2 = E-12 m^2

when I multiply those, I get E1 A/m^2 * E-12 m^2 = E-11 A

so to obtain the current in nA (E-9), I would multiply this with E2, meaning a multiplication by a factor of 100.

In previous code and posts here, I saw a factor of 1/100. This would be obtained, if one took cm^2 as E-2 m^2 and um^2 as E-6 m, ignoring that it's squared?

Thanks!