A transformer in a neon sign contains 20 truns in the primary coil and 80 truns in the secondary coil. Which is greater- the output voltage or the input voltage?

The output voltage is greater.

Explanation:

The turns ratio is directly proportional.  Vs=  Vp X (ns/np)

In this neon sign xformer example it is 80/20  or 4

So secondary voltage for 120 volt primary/line voltage = 480 volt secondary volts.

This is practical in a neon sign as it takes more voltage to start the neon gas excitation.

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