In the following figure, what is the value of the potential at points a and b? (Figure 1) Express your answer using two significant figures separated by a comma.
Answer
According to Kirchhoff's voltage law, the current flow through the circuit is,
9-2 I-6-I=0\\
3 I =3 \\
I =1 \mathrm{~A}The potential at point a is,
V_{a}-0=9 V
V_{a}=9 \mathrm{~V}
The potential at point b is,
V_{b}-0=I(1 \Omega)
V_{b}=1 \mathrm{~V}
Thus, the answer is 9,1.
