# I need help in understanding faradays law? Answered

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.

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This is probably the simplest answer I could find for you...

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.

In the example, they've explained that...

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