To introduce young people at school at early stage to engineering profession, an activity such as giving a lecture and some demo to them becomes important. This activity will hopefully create better understanding on engineering world especially in the field of electrical engineering by introducing an increasingly popular technology called IoT (Internet of Things). The target school is SMK Muhammadiyah 02 Tangerang Selatan. Because of COVID-19 pandemic situation and PSBB rules implemented in Tangerang Selatan in which school students had to study from home, then the lecture was given online by Zoom application on Tuesday, August 18th at 13.30 – 15.00 WIB. The partcipants attending the online lecture reached 26 consisting of grade III students of Computer Network program and some teachers as well. The results of the questionnaires given shortly before the webinar ends show that for Introduction of Engineering Profession, the majority of them (61,54%) states Interesting Enough, for Introduction of IoT the majority (57,69%) says Interesting and for IoT Demo the majority (53,85%) thinks Interesting Enough. The benefit of this webinar is clear when the majority of participants (57,69%) agrees Beneficial to them and all of them (100%) say Agree that this activity is also introduced to other students at school

Putaran input poros rotor magnet permanen pada alternator sepeda motor yang menimbulkan perubahan fluks medan magnet melintasi bidang lingkaran penghantar kumparan fasa stator menghasilkan parameter out put energi listrik ac. Pada rancang bangun energi mekanis out put motor listrik ac menggerakkan putaran poros puli rotor magnet permanen alternator pada kecepatan rpm Vrpm1(rotor) = 2880,6 rpm dengan lama sudut putar medan magnet t1(θ.magnet) = 3,47 mS melintasi bidang penghantar kumparan fasa stator menghasilkan parameter listrik ac parameter frekuensi f0(ac.fasa) = 140,8 Hz dan tegangan listrik V01(ac.fasa) = 202,6 volt pada out put alternator. Kemudian dilakukan perubahan energi mekanis pada kecepatan rpm Vrpm2(rotor) = 2500,2 rpm untuk lamanya t2(θ.magnet) = 3,99 mS menghasilkan perubahan frekuensi menjadi f02(ac.fasa) sebesar 116,7 Hz dan V02(ac.fasa) sebesar 170,2 volt. Kesimpulannya energi mekanis out put putaran motor listrik ac pada kecepatan rpm tertentu menggerakkan putaran puli rotor magnet permanen untuk melintasi lingkaran bidang inti normal kumparan fasa stator menjadi faktor isyarat yang menentukan sinyal frekuensi f0(ac.fasa) dan tegangan listrik ac V0(ac.fasa) pada out put alternator.