- #1

Rhirhi

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## Homework Statement

I'm a bit thrown at this problem as I am unsure if firstly my equations so far are correct and secondly where/how I need to factor in the 50 Hz part. Or is this a red herring? Also, am I correct in thinking that the emf means voltage?

Any help would be appreciated

*A single-phase transformer having a primary winding of 380 turns is connected to a 400 V, 50 Hz single phase supply.*

Calculate:

a the emf induced in the secondary winding of 100 turns;

b the current in the secondary winding if the primary winding carries a current of 20 amperes;

c the number of turns required in the secondary winding to produce an emf of 230 V.

Calculate:

a the emf induced in the secondary winding of 100 turns;

b the current in the secondary winding if the primary winding carries a current of 20 amperes;

c the number of turns required in the secondary winding to produce an emf of 230 V.

## Homework Equations

a[/B]

Vs = Ns x Vp / Np

Vs = 100 x 400 / 380

**b.**

Is = Ip x Vp / Vs

Is = 20 x 400 / 105.3

**c.**

Ns = Np x Vs / Vp

Ns = 380 x 230 / 400

## The Attempt at a Solution

a. = 105.3 V

b. = 76A

c. = 218.5

[/B]