mehavecupcake

Joined Feb 26, 2016
6
Hi,
Just wondering if I could get some help. I'm doing a project on AC and I need to know what they used to find out that alternating current is a wave.

#12

Joined Nov 30, 2010
18,224
The wave theory of electricity is a theory, so I would have to guess the instrument used was a human brain or mathematics.

mehavecupcake

Joined Feb 26, 2016
6
Thanks!
So that means no device was used to figure out that AC travels in a sine-wave like shape?

mehavecupcake

Joined Feb 26, 2016
6
Sorry, let me rephrase the question.

How would Nikola Tesla have proven that his Poly-phase Distortion Motor produced alternating current as opposed to direct current?

#12

Joined Nov 30, 2010
18,224
Faraday. Electrical movement is caused by a magnet and a wire that are moving relative to each other. If they move, the amplitude simply must change. At what rate? That goes to simple geometry. Magnetic density at a distance changes according to the amount of distance. Figure the motion and the relative intensity and you have a sine wave.

crutschow

Joined Mar 14, 2008
34,844
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How would Nikola Tesla have proven that his Poly-phase Distortion Motor produced alternating current as opposed to direct current?
He could have "proved" it was alternating current by showing that it would magnetically couple between two coils, whereas DC wouldn't.

nsaspook

Joined Aug 27, 2009
13,571
What is a Poly-phase Distortion Motor?

#12

Joined Nov 30, 2010
18,224
I get a lot of google hits about why voltage and current distortion is bad in polyphase motors, but nothing about intentional distortion inflicted on or resulting from a polyphase motor.

mehavecupcake

Joined Feb 26, 2016
6
What is a Poly-phase Distortion Motor?
It's Tesla's AC motor.
Poly-phase refers to "multiple stage".
I meant to say induction instead of distortion
And motor is pretty self explanatory.

mehavecupcake

Joined Feb 26, 2016
6
I'm also doing another project on motor distortion.

nsaspook

Joined Aug 27, 2009
13,571
It's Tesla's AC motor.
Poly-phase refers to "multiple stage".
I meant to say induction instead of distortion
And motor is pretty self explanatory.
Learn something new everyday.

JoeJester

Joined Apr 26, 2005
4,390
Poly-phase refers to "multiple stage".
Poly, as a prefix, means many. I took your phrase Poly-phase, to mean many phases, not multiple stage. Polyphase was originally used to describe three phase systems in the early days accoring to this website.