Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsQuestion Bank [ 2022 ]3 Marks
Question
Explain step up and step down transformer?
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Answer
Step-up transformer:
a. A transformer that converts a low voltage at high current into a high voltage at low current is called a step-up transformer. b. In a step-up transformer, the number of turns in secondary coil $N_S$ is greater than the number of turns in primary coil $N_P$. In this transformer, $e_S > e_P$ and $I_S < I_P$. c. The primary coil is made from a thick insulated copper wire so that it can sustain the high current. The secondary coil is made of a thin insulated wire. d. Current through secondary is less than primary.
Step down transformer: a. A transformer which converts a high voltage at low current into a low voltage at high current is called a step-down transformer. b. In step down transformer, the number of turns in the secondary coil $N_S$ is less than the number of turns in the primary coil $N_P$. In this transformer $e_S < e_P$ and $I_S > I_P$. c. The primary coil is made of a thin insulated wire and the secondary coil is made from thick wire so that it can sustain the high current. d. Current through primary is less than secondary.
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