The transformer needed is a step what transformer?= it has what turns on the primary and on the secondary coil

Question

A transformer is used to power a model-railway.The railway requires a 12v supply and the mains supply is 240v.

Answer 1

its a step down transformer. 240 input so there is no voltage drop in long lenghts of track. if it was 12v input 6 ft down the track it would drop to about 10v and so fourth

Answer 2

Don't listen to Trevor, it is a step down transformer, with a rectifying circuit, to change from 240v AC to 12v DC. The 12v goes to the track, volt drop or not!

Answer 3

You need a step down transformer with a ratio of turns that is 20:1.  However most electric model trains also have a rectifier because the train runs on D.C. with the voltage being regulated through a rheostat from 0 to 12V.

Answer 4

You need a step down transformer.  

This will get you down to say 10 volts AC.

This will mean a turns ratio of 240:10 or 24:1.

Actual number of turns depends on the core design.

Look up core manufacturer's data.

You will also need a rectification circuit., a straight bridge rectifier and smoothing capacitor will then give you about 12 volts DC.  

Then you need some form of control, like a potentiometer.

Most train controllers, however, are far more sophisticated than this.

Answer 5

You need a STEP DOWN transformer. It also needs a smoothed Full-Wave (half-wave or unsmoothed current can damage the motors) rectifier to provide Direct Current to the track and some sort of variable resistor to control the current to your locomotives.

Answer 6

You are right. The transformer needed is a step what transformer?= it has what turns on the primary and on the secondary coil

A transformer is used to power a model-railway.The railway requires a 12v supply and the mains supply is 240v.

Answer 7

A transformer to operate your model trains is readily available from any hobby store or on line retailer.

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