Änderungen
Aus Hackerspace Ffm
'''In Detail:'''<br>
The best way to get a better understanding is to have a look at the principle of voltage divider.<br>
[[Datei:voltagedividerVoltage-divider-shunt.jpgpng]]<br>
In a voltage divider the current is always the same.<br>
[[Datei:I_total.gif]]<br>
This table displays how the resistance value of the shunt (R2) R_shunt drains power if it is too high.
Also you can see how small the voltage drop gets if the resistance is to low, what makes it hard to measure.
{| class="wikitable"
|-
! I (total)
! U (total)
! R_load
! R_shunt
! U (load)
! U (shunt)
! P (lost)
|-
| 0,25A
| 5V
| 10
| 10
| 2.5V
| 2.5V
| 0.625W
|-
| 0,25A
| 5V
| 19
| 1
| 4.75V
| 0.25V
| 0.0625W
|-
| 0,25A
| 5V
| 19.9
| 0.1
| 4.975V
| 0.025V
| 0.00625W
|}
==How to measure==
*Energy consumption
*Battery charging
==Alternatives==
Hall-Effect current sensing
