diff --git a/cst337/lec/lec6.md b/cst337/lec/lec6.md
index c115a8e..9f9449a 100644
--- a/cst337/lec/lec6.md
+++ b/cst337/lec/lec6.md
@@ -13,12 +13,15 @@ Both types however, do share some properties here by referred to as the followin
 
 ### NPN
 
-When the base/gate is "on" we mean current can flow from the emitter to the collector.
+![](../img/lec6npn.png)
+
+Current will __not__ flow  across collector through base into emitter if do nothing.
+When we apply a current to the base then current flows through the transistor.
 
 ### PNP 
 
-When the base/gate is "on" we mean current can _not_ flow from the emitter to the collector.
-
-> When we say that a gate is "on" we're really saying that it's open.
+![](../img/lec6pnp.png)
 
+Current will flow across emitter through base into collector if we don't do anything.
+When we apply a current to the base then current flow stops.