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Dotted LIGHT
from
one single wire
… a simple electric circuit
• low voltage power - supply
• and a thin wire
Suppose the current is large enough to make the wire glow,
what would you expect ?
A
B
and this is what you will see :
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 ?
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
in addition:
…with a direct current
both of these pictures A and B
are wrong !
What you really get …
…is this
Think
HOT !!!