A lathe was designed to operate from a 240 V supply to obtain the 1200 W power.

Question

A lathe was designed to operate from a 240 V supply to obtain the 1200 W power. 1. What turns ratio Np/Ns required on a transformer to operate a 120V ac supply? 2. Step up? Or step down? 3. What current will draw from the 120V line? A lathe was designed to operate from a 240 V supply to obtain the 1200 W power. 1. What turns ratio Np/Ns required on a transformer to operate a 120V ac supply? 2. Step up? Or step down? 3. What current will draw from the 120V line? 1. What turns ratio Np/Ns required on a transformer to operate a 120V ac supply? 2. Step up? Or step down? 3. What current will draw from the 120V line?

Explanation / Answer

1. NP/NS=Vin/Vout

=120/240=0.5

2. As NP/NS <1 it is step down transformer.

3. V*I=power

                120*I=1200

                I=10 A

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