1. ?
Dotted
LIGHT
from
one single wire

2. … a simple electric circuit
low voltage power - supply
and a thin wire

3. Suppose the current is large enough to make the wire glow,
what would you expect ? A B

4. and this is what you will see :

5. … and guess a reason for this
Look closer …
… and guess a reason for this
You see the shape of the glowing spots
And think of the space between them
Have you seen this before ?

6. an alternating current
You are right !
It’s a standing wave
And how to get this ?
All you need is …
A magnet !
and of course ….
an alternating current

7. are wrong ! in addition: …with a direct current
both of these pictures A and B
are wrong !

8. What you really get …
Think
HOT !!!
…is this