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

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 2

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 3

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 4

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 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

If a short circuit on the secondary will blow the primary fuse or circuit breaker, OR if the transformer is "impedance protected," which means it can be shorted forever without overheating, then it needs no secondary circuit protection.

Answer 7

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Have a nice day

Answer 8

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 9

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

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