Do not forget that we have supposed the directions of the currents, in the final
answer if we get a positive answer, like and the direction we have supposed is true, but
𝐼
1
𝐼
2
if we get a negative answer, like the direction we have supposed is wrong, so we must
𝐼
3
reverse it.
The equation will be changed to:
𝐼
1
= 𝐼
2
+ 𝐼
3
𝐼
2
= 𝐼
1
+ 𝐼
3
Now, it is easy to calculate the voltage on the resistors using Ohm's law:
𝑉 = 𝐼 · 𝑅
The voltage on 2.2 kΩ
𝑉 = 𝐼
1
· 2. 2 𝑘Ω
𝑉 = 0. 002586 · 2200 Ω
𝑉 = 5. 7 𝑉
The voltage on 680 Ω
𝑉 = 𝐼
3
· 680 Ω
𝑉 = 0. 003957 · 680 Ω
𝑉 = 2. 7 𝑉
The voltage on 47 Ω
𝑉 = 𝐼
2
· 47 Ω
𝑉 = 0. 00655 𝐴 · 47 Ω
𝑉 = 0. 3 𝑉
Now, let us make this circuit in reality and measure the voltage around the resistors using
the multimeter.
The measured voltage around the 2.2 kΩ resistor is 6.23 V.
To Next Page
Loading...
