Problem 12
R?
+
100 V
A
R?
20 V
B
a) In the voltage divider shown in the figure above, find out the value of $R_2$, if $R_1$ is
1) 8 k$\Omega$, and 2) 0.8 k$\Omega$, and 3) 80 $\Omega$. In each case, find out the power rating of
resistor $R_1$. Power rating is the power a resistor should be able to dissipate without
overheating. The higher the power rating, the bigger and more expensive the
resistor.
b) If a load resistance of 10 k$\Omega$ is to be connected across A-B (in parallel with $R_2$),
find the voltage regulation (VR) for each of the three cases analyzed in part (a).
$VR = \frac{(V_{no-load} - V_{load})}{V_{no-load}} \times 100 \%$. If the allowed VR is $\pm 10\%$, which
combination of $R_1$ and $R_2$ will you choose? Why?
