Calculate A step-down transformer reduces a 2,400-V current to 120 V. If the pri

Question

Calculate A step-down transformer reduces a 2,400-V current to 120 V. If the primary coil has 500 turns of wire, how many turns of wire are there on the secondary coil?

27. Use a Ratio To produce a spark, a spark plug requires a current at about 12,000 V. A car’s engine uses a type of transformer called an induction coil to change the input voltage from 12 V to 12,000 V. In the induction coil, what is the ratio of the number of wire turns on the primary coil to the number of turns on the secondary coil?

Explanation / Answer

a)for step down transformer V1=2400v,V2=120v,n1=500,n2=?

transformer ratio n2/n1=V2/V1

n2=(120/2400)*500=25

b)ratio of turns n2/n1=V2/V1

n2/n1=12000/12=1000/1

ratio of turns on the  primary coil to the number of turns on the secondary coil=n1/n2=1/1000

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