ch 1 lesson 1 part 1 (Q1 _ Q18)
55:08
ch 1 lesson 2 part 2 (Q41 _ Q63)
1:06:15
wave motion part 1 (1 _ 40)
38:45
ch 1 lesson 1 part 2 (19 _ 37)
1:41:55
ch 1 lesson 2 part 7
32:17
الامتحان الاسبوعي 23 الفصل الثالث
2:09:11
ch 1 lesson 2 part 6 (ammeter and voltmeter reading)
1:32:29
ch 1 lesson 3 part 1 (1 _ 30)
42:33