Current in vacuum and gases
Answers are for parents and teachers.
1
2·10¹⁹ electrons pass in 4 s (e = 1.6·10⁻¹⁹ C). The current in A?
0.8
2
Anode and cathode: which is heated in a diode?
The cathode.
3
What carries the current in gases?
Free electrons, and positive and negative ions.
4
Why does air near a flame become conducting?
The flame ionises air molecules and charge carriers appear.
5
How should you behave near high-voltage equipment?
Do not approach or touch it, and tell an adult.