A model of electric train requires a low voltage to operate. if theprimary coil

Question

A model of electric train requires a low voltage to operate. if theprimary coil of its transformer has 400 turns, and the secondaryhas 40 turns, how many volts will power the train when the primaryis connected to a 120-volt household circuit?

A transformer has an input of 9 volts and an output of 36 volts. ifthe input is changed to 12 volts, what will the output be?

if the number of secondary turns is 10 times the number of primaryturns, and the input voltage to the primary is 6 volts, how manyvolts will be induced in the secondary coil?

Explanation / Answer

=we know that fro transformer es/ep=ns/np=ip/is------------------------------------1 where es= voltage across secondary coil ep=voltage across primary coil ns=number of turns in secondary coil np="             "  "     "   primary coil is= current in secondary coil ip= current in primary coil 1>. according toquestion from 1 es/120=40/400 or es=120/10=12answer 3.>againfrom 1 given that ns=10np es/ep=ns/np es/6=10np/np es=60 Answer 2.> we know that      letes' and ep' be thevoltage change in secondary and in primary coil      since we are changing thevoltage     therefore number of turns in coil will notchange        es'/ep'=ns/np=es/ep es'/12=36/9 es'   = 4*12   es'   = 48Answer es'/12=36/9 es'   = 4*12   es'   = 48Answer

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