Step Up vs Step Down: Exploring the Difference

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In summary: More turns means more voltage, and hence more current. Therefore, more turns will create more flux and less current.
  • #1
toneboy1
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If you've got more windings on the primary (step up) then I imagine that there'll be more magnetic field lines flowing through the core, than if you had less windings on the primary (step down), to apply voltage to. Is this correct? If so, what is it that makes a step down as powerful as a step up, are the less field lines 'stronger' or something in a step down?


Thanks very much.
 
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  • #2


Few things:
1. More winding in primary less in secondary is Step-Down transformer
2. If you apply same voltage to two different coils, A with more no. of turns and B with Less no. of turns then, the total magnetic flux created by the coils in the Core will be more by B than A. Yea, more the turns less the flux.

If you understand the Reason for no. 2 then probably you will have answer to your queries.
 
  • #3


thecritic said:
more the turns less the flux.

Why is that?
 
  • #4


because we have E = N d(phi)/dt. If you apply equal voltage to two different coils, then the one with more turns can generate enough induced voltage to oppose the applied voltage by generating lesser amount of flux (phi).
If you pass equal currents, then ofcourse, the one with more turns will generate more flux.
 
  • #5


Flux is directly proportional to Number of turns x Current flowing through them.

Applying same voltage to lesser number of turns will cause more current and more flux.
 
  • #6


thecritic said:
Few things:
1. More winding in primary less in secondary is Step-Down transformer

God, how embarassing, it was really late and I wasnt thinking.

So because the more turns you wind, the less current you get hence less flux? (nothing to do with lenz's law)

What property is it that allows for more windings on primary (step down) to create more current in the primary that is obviously beneficial, if there is less flux?thanks very much
 
  • #7


berkeman said:
Why is that?

Because the higher the turns, the more voltage is induced.

Hence less current, and it's the current which produces the flux.
 
  • #8


toneboy1 said:
So because the more turns you wind, the less current you get hence less flux? (nothing to do with lenz's law)
Ahh! not quite. Consider this.
Suppose there are two coils A and B. A has say 100 turns and is wound on high grade Iron core. Suppose B has 1000 turns but don't have any core (air core). We now apply a sinusoidal voltage of maginitude 100V to both coils.
Now for A.
E = N d(phi)/dt
100sin(wt) = 100 d(phi)/dt
solving for phi, phi = - Cos(wt). That is phi has magnitude of 1 for A.
Similarly for B
we have, phi = -0.1Cos(wt). That is phi has magnitude of 0.1 for B

So, upto now we are consistent that, the flux is less in B (more turns) than A.

Now for the current.
Current in A = Current required to setup flux of 1 in Iron
Current in B = Current required to setup flux of 0.1 in Air

Beasue magnetic permeability of Iron (u) is around 2000 times of Air, current in A will be 200times smaller than in B.

So, the lesson is, what current flows is subjective to on what you make winding. But, the flux, will be independent of on what you wind. So, Don't go for current, just remember fundamental faradays law
E = N d(phi)/dt
 

1. What is the difference between "Step Up" and "Step Down" in terms of scientific research?

Step Up and Step Down are two different approaches to conducting scientific research. Step Up involves starting with a small-scale study and gradually increasing the complexity or scale of the research. Step Down, on the other hand, involves starting with a large-scale study and then breaking it down into smaller, more focused studies.

2. Which approach is more commonly used in scientific research?

Both approaches are commonly used in scientific research, but the choice often depends on the specific research question and available resources. Step Up is often used for exploratory research and hypothesis generation, while Step Down is more suitable for confirming or testing specific hypotheses.

3. Can both approaches be used in the same research project?

Yes, it is possible to use both Step Up and Step Down approaches in the same research project. For example, a researcher may start with a Step Up approach to generate hypotheses, and then use a Step Down approach to test those hypotheses in a more controlled and focused manner.

4. What are the advantages of using a Step Up approach?

One advantage of a Step Up approach is that it allows researchers to start with a smaller, less complex study and gradually build up to more complex or larger-scale studies. This can help in identifying potential issues or challenges early on and making necessary adjustments before investing more time and resources.

5. What are the advantages of using a Step Down approach?

A Step Down approach may be more efficient and cost-effective for confirming or testing specific hypotheses, as it allows researchers to focus on a specific aspect or variable of the research question. It can also help in reducing the risk of false positive results by breaking down a larger study into smaller, more controlled studies.

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