DC Circuits
0. Uncertainty of DMM
0. Uncertainty of DMM
If the uncertainty in the reference manual gives an equation of
m% + n dgt,
it means that, say your measured value is x = abc.defg, then
δx = m%*x + n*0.0001.
1. Kirchhoff's Laws
1. Kirchhoff's Laws
If z = x + y, then
.
2. Ohm's Law: V = I R
2. Ohm's Law: V = I R
Rewrite (Linearize)
as
.
Given U and I are measurable, their associated uncertainties are
,
and
.
For a resistor, the intercept d = ln(a) = ln(R), which makes
,
and
.
We are testing b = 1 for the resistor, so don't assume the relationship is linear.
If b ≠ 1, we can't say that it follows Ohm's law (V = I R).