diff --git a/concepts/em/u11/e11-3-power.tex b/concepts/em/u11/e11-3-power.tex
index 7610450..9f0f789 100644
--- a/concepts/em/u11/e11-3-power.tex
+++ b/concepts/em/u11/e11-3-power.tex
@@ -12,7 +12,7 @@ The SI unit of power is the watt ($1\,\mathrm{W}=1\,\mathrm{J/s}=1\,\mathrm{A\!\
 
 \ex{Illustrative example}{A $60\,\mathrm{W}$ incandescent lightbulb is connected to a $120\,\mathrm{V}$ household outlet. Find (a) the current through the bulb and (b) the resistance of its filament.
 
-\sol (a) From $P = I\,\Delta V$,
+(a) From $P = I\,\Delta V$,
 \[
 I = \frac{P}{\Delta V} = \frac{60\,\mathrm{W}}{120\,\mathrm{V}} = 0.50\,\mathrm{A}.
 \]