# I need help in understanding faradays law?

So this is where i was trying to understand his law, http://www.6pie.com/faradayslaw.php, the part that i got stuck was on where it says, "Lets figure 5 turns per second, that gives us 300 RPM. If we do a good blade design we might be able to get 300 RPM in 3 to 5 mile winds.

5 turns per second gives us one turn every .2 seconds

seconds = .2"

I am trying to apply this to a bike and want to know how to get past this step to getting Δt of the formula.

5 turns per second gives us one turn every .2 seconds

seconds = .2"

I am trying to apply this to a bike and want to know how to get past this step to getting Δt of the formula.

active| newest | oldestSomething spinning at 300 RPM is spinning once every 0.2 seconds. Or 5 revolutions per second, or 60*5 revolutions (300 RPM) or 60/0.2 = 300 RPM.

Steve

5 turns per second. 60 seconds per minute. 5 X 60 = 300.... or 300 RPM (Revolutions per minute).

Faraday's Law: V = -NΔφ/Δt . Here N is the number of loops, Δφ is the change in flux, and Δt is the time required for the change.

So the "time required" for one full turn in the example is 0.2

(5 turns per second gives us one turn every .2 seconds)

How you determine what your number is depends on the RPM you have.

GoodNIGHT.

Steve

_{Sciatic nerve pain... can't lay down to go to sleep. Got the laptop with me on the couch with an ice pack. }Steve

_{BTW... I sent a reply. I think the filters got it... *sigh*}They figured out they could get 300 RPM (revolutions per minute)

300 divided by 60 seconds in a minute = 5 full revolutions per second.

But you want the time it takes for ONE full revolution (not 5).

So 1/5 of a second = 0.2 seconds. (The time it takes to complete ONE full revolution).

As an equation, I think you need something like this:

Δt = 1/ (RPM/60)Δt = 1(second) divided by the RPM divided by 60

= Δt = 60/RPM, by definition.

Don't forget to click one the blue buttons so that it marks your question as "answered" on the main page. :-)