The voltage in the secondary coil is 1800 V.
What is the transformer?
We define the transformer as a device that is able to step up or step down the voltage. Given that we are told that a step-up transformer has 20 primary turns and 300 secondary turns. if the primary voltage is 120 v.
We us the relation;
Es/Ep = Ns/Np
Es = secondary voltage
Ep = primary voltage
Ns = Number of turns in secondary coils
Np = Number of turns in primary coil
Thus;
Es/120 = 300/20
20Es = 120 * 300
Es = 120 * 300/20
Es = 1800 V
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