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A transformer has 800 turns in the primary and 40 turns in the secondary winding. The alternating e.m.f connected to the primary is 240V and the current is 0.5A

Determine

  1. the secondary e.m.f
  2. the power in the secondary if the transformer is 95% efficient

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  1. SekphycP2A15bi
    Vp = 240V
    Ip = 0.5A
    Ns/Np = Vs/Vp
    40/800 = Vs/240
    Vs= (40 x 240)/800
    =12V

  2. VsIs = 95% VpIp
    95/100 x 240 x0.5
    =114W
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