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A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in the load, what is the current in the primary coil ? Comment on the type of transformer being used. |
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Answer» SOLUTION :`P_S`=60 W, `I_S`=0.54 A `I_P`= ? , LINE voltage `V_P`= 220 V `P_S=V_S I_S` `therefore V_S=P_S/I_S=60/0.54` =111.1 V `therefore V_S APPROX` 110 V `therefore V_S lt V_P` hence , step-down transformer is used. The transformation ratio, `r=V_S/V_P=I_P/I_S` `therefore I_P=I_S xx V_S/V_P` `=0.54xx110/220` `therefore I_P`=0.27 A |
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