diff --git a/Electronic/Lecture 1.md b/Electronic/Lecture 1.md
index 756a9d4..ee78696 100644
--- a/Electronic/Lecture 1.md	
+++ b/Electronic/Lecture 1.md	
@@ -1,4 +1,5 @@
-(Insert diagram here) E : the voltage corresponding to Ua - Ub = Uab
+<img src="https://i.imgur.com/ZPadVTR.jpg" /img>
+E : the voltage corresponding to Ua - Ub = Uab
 V = Ub - Uc
 The current correponding to the flow of electrical electrons from A to C in A