Plusivo DM301B - Example

8.3.3 Example
Calculate the voltage around the resistors.
In this case, we are going to use Kirchhoff's law, we need to suppose the paths for offthe current
to use Kirchhoff's current law, and we need to suppose two loops to use Kirchhoff's voltage law.
To use Kirchhoff's voltage law, we need to know some rules, for example, in if the loop passes
𝐿
1
the battery from - to + we write it in the equation (+3 V), but if the loop passes the battery from + to - we
write it in the equation (-3 V). Let us take 2.2 resistor as an example, if the loop passes the resistor in
𝑘Ω
the same direction with the current we write it , but if the loop passes the resistor in the
− 2. 2 𝑘Ω · 𝐼
1
( )
opposite direction with the current we write it ( ).
+ 2. 2 𝑘Ω · 𝐼
1
We get this equation from .
𝐿
1
Equation 1:
3 𝑉 − (𝐼
1
· 2. 2 𝑘Ω) − (𝐼
3
· 680 Ω) = 0 𝑉
27
Mastering the Art of Measurement (DM301B Digital Multimeter) r.01 www.plusivo.com