The rms current in the primary coil of a transformer is 0.5 Ampere .
Energy/power is not gained or lost going through an ideal transformer.
Consequently, the transformer in this situation doesn't really matter. The entire device receives 60 watts of power from the wall outlet if the lamp consumes energy at a rate of 60 watts.
∴ Power = (voltage) x (current)
60 watts = (120 v) x (current)
Current = (60 watts) / (120 v)
Current = 0.5 Ampere
Therefore, the rms current in the primary coil of a transformer is 0.5 ampere.
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