At the end of this video, students should be able to :

• Define thermionic emission
• Define cold and hot cathode
• Explain gas discharge tube
• Explain the aplication of thermonic emission
• Explain cathode ray Osciliscope

This video will help an O-level or Senior secondary school student prepare for exams such as WEAC, UTME, JAMB, GCE, IJMB, JUPEB, KCPE, and SSCE to come out with flying colors. You can study and practice more questions using the ExamGuide app. The app scores you and explains all the questions at the end of the practice. You can practice a particular topic of interest with different modes like study, mock, and practice modes. It also has other features that make learning fun. It is a must-have for any serious student. Download from www.examguide.com if you don’t have it yet.