Some questions regarding Electromagnetism

[Darryl]

yes, that link is broken for me as well Danger.

it tries hard..

 

[apples]

ok so you're saying that I should use a DPDT switch. however a DPDT switch needs to be manually changed, and for that you're saying I should use a blinking light.
but I don't think that would work.
One reason, the heating/bending part would wear out very very quickly, so if I use it continuously for 7 hours, they're is no way it can survive.
However, this would solve the problem of how fast it would move up and down, because you're saying the more current I would give to the blinking light the more quickly the current would change.
but the problem is the blinking light. I don't think it wold work for long...

What do you say?

 

[Darryl]

as well as DPDT switches you can get DPDT Relays. then you use the Blinker / timer unit to switch the relay ON or OFF.

thats how you get the voltage crossover, from a simple ON/OFF switch, (the Blinker unit).

a bi-matalic strip, will last for years and years and years.

they are used in cars, are very reliable, and will go for years, without a problem.