Plusivo DMM - 6.3 Kirchhoffs Law

So if we calculate the new values:
(3.29 𝑉)
2
508 Ω
= 21. 3 𝑚𝑊
We can count on our calculation “ ”
(3 𝑉)
2
510 Ω
= 0. 0176 𝑊 = 17. 6 𝑚𝑊
because
17.6 mW is almost equal to 21.3 mW.
If we want to use the current to calculate the power.
Figure 19. The measured current in this figure is 6 mA.
We can use the first formula which is:
𝑃 = 𝐼 · 𝑉
3. 29 𝑉 · 6 𝑚𝐴 = 0. 0197 𝑊 = 19. 7 𝑚𝑊
And the second formula which is:
𝑃 = 𝐼
2
· 𝑅
(6 𝑚𝐴)
2
· 510 Ω = 0. 0183 𝑊 = 18. 3 𝑚𝑊
So all the formulas are almost equal to each other: 21.3 mW, 19.7 mW, 18.3 mW
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Mastering the Art of Measurement (Digital Multimeter) r.01 www.plusivo.com