in some places insect \"zappers\" with there blue lights, are afamiliar sight on

Question

in some places insect "zappers" with there blue lights, are afamiliar sight on a summer's night. These devices use a highvoltage to electrocute insects. One such devise used a acvoltage of 4440V, which is obtained from a standard 120-V outlet bymeans of a transformer.If the primary coil has 21 turns, how manyturns are in the secondary coil.?

Next question is, the batteries are rated 9 V and a current of 223mA to charge them. The wall socket provides a voltage of120V. a)Determine the turn ratio of the transformer b)what is thecurrent coming from the wall socket? c)find the average powerdelivered from the wall socket and the average power sent to thebatteries?

Explanation / Answer

Given : Out put voltage ( Vo ) = 4440 V Input voltage ( Vi ) = 120 V No of turns in primary coil = Np = 21 If Ni = No of turns in the secondary coil.    Then by tranformer equation Ni / Np = Vi /Vo     Ni = Np Vi / Vo          = 21 ( 4440 V/ 120 V )          = 777

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