Astep up transformer has 250 turns on its primary and 500 turns on it secondary. when the primary is connected to an200 v and the secondary is connected to a floodlight that draws 5a, what is the power output? show all your work

Since the secondary winding has twice as many turns as the primary winding, the voltage induced in the secondary will be double the voltage that you apply to the primary.

If you connect a source of 200 volts to the primary, then you will measure 400 volts across the secondary.  (Note:  Please work with AC only.  If you apply DC to a transformer, the output consists entirely of smoke.)

Power = (voltage) x (current)

If a floodlight across that secondary winding draws 5 Amperes, then the power dissipated by the light is

Power = (400 v) x (5 A)

Power = (2,000) VA

Power = 2,000 watts

Power = 2 kilowatts

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