diff --git a/ELK2_FS/formelsammlung.pdf b/ELK2_FS/formelsammlung.pdf
index 23c9c02..a77cd1b 100644
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diff --git a/ELK2_FS/img/img_07_MOS_dynamisch.png b/ELK2_FS/img/img_07_MOS_dynamisch.png
deleted file mode 100644
index 4778743..0000000
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diff --git a/ELK2_FS/img/img_07_MOS_ohmsch.png b/ELK2_FS/img/img_07_MOS_ohmsch.png
deleted file mode 100644
index 99df8d3..0000000
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diff --git a/ELK2_FS/img/img_07_Millerplateau.png b/ELK2_FS/img/img_07_Millerplateau.png
deleted file mode 100644
index d85aef5..0000000
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diff --git a/ELK2_FS/latex4ei/latex4ei_boxes.sty b/ELK2_FS/latex4ei/latex4ei_boxes.sty
index 538ccfb..5b8bc33 100644
--- a/ELK2_FS/latex4ei/latex4ei_boxes.sty
+++ b/ELK2_FS/latex4ei/latex4ei_boxes.sty
@@ -71,6 +71,20 @@
 		linecolor=col_emphbox
 	}
 
+
+% Basicbox: white box
+% ----------------------------------------------------------------------
+	\global\mdfdefinestyle{basicbox}{
+		% basic style
+		style=specialbox,
+		align=center,
+		% background color
+		backgroundcolor=col_sectionbox!0, %white%
+		% frame color
+		linecolor=col_sectionbox
+	}
+
+
 % Symbolbox
 % ----------------------------------------------------------------------
 	\global\mdfdefinestyle{symbolbox}{
@@ -148,6 +162,10 @@
 % ----------------------------------------------------------------------
 	\newmdenv[style=symbolbox]{symbolbox}
 
+% basicbox
+% ----------------------------------------------------------------------
+	\newmdenv[style=basicbox]{basicbox}
+
 % tablebox
 % ----------------------------------------------------------------------
 	\newmdenv[style=tablebox]{tableboxframe}
diff --git a/ELK2_FS/thema7_leistungselektronik_schalter.tex b/ELK2_FS/thema7_leistungselektronik_schalter.tex
index 233c6cb..25ee86d 100644
--- a/ELK2_FS/thema7_leistungselektronik_schalter.tex
+++ b/ELK2_FS/thema7_leistungselektronik_schalter.tex
@@ -232,7 +232,7 @@ Max. Wirkleistung aufg. max. zulässig innerer Temperatur:
 $E_{on}, E_{off}$ bei ohmsch induktiver Last
 \begin{emphbox}
   \item{$E_{on} = I_{D,on} \cdot U_{DS,off} \cdot \frac{t_{fall}(U_{DS})}{2}$}
-  \item{$E_{off} = I_{D,off} \cdot U_{DS,off} \cdot \frac{t_{rise}(U_{DS})}{2}$}
+  \item{$E_{off} = I_{D,on} \cdot U_{DS,off} \cdot \frac{t_{rise}(U_{DS})}{2}$}
 \end{emphbox}}
 \parbox{0.5 \textwidth}{
 $E_{on}, E_{off}$ bei ohmscher Last