A step up transformer has 250 turns on its primary and 500 turns on it secondary. When the primary is connected to a 200 V and the secondary is connected to a floodlight that draws 5A, what is the power output?

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Answer 1 · 2017-03-14T18:31:24

The power output is $=2kW$

The equation of the transformer is

$n_p/n_s=U_p/U_s$

$n_p=250 t$

$n_s=500 t$

$U_p=200V$

$U_s=n_s/n_p*U_p$

$=500/250*200=400V$

The power output is

$P_s=U_s*I_s=400*5=2000W=2kW$