A transformer uses iron to make sure that all the magnetic flux passing throughthe primary ("sending") coil also goes through the secondary ("receiving") coil. UseFaradays Law to show that the ratio of the voltages on the primary and the secondaryassuming the resistance of the coils is negligible (in other words, the only voltage acrossa coil is the induced voltage given by Faraday), is simply the ratio of the number of turns4. of wire in the primary and secondary. (Hint-it is probably easiest to work backwards:start with the notion of the flux to calculate the voltage on each coil.) If a 12 Vtransformer for your portable CD player has 100 turns of wire on the 120 V coil, howmany turns are on the secondary (12 V side)?

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Asked Dec 1, 2019
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A transformer uses iron to make sure that all the magnetic flux passing through
the primary ("sending") coil also goes through the secondary ("receiving") coil. Use
Faradays Law to show that the ratio of the voltages on the primary and the secondary
assuming the resistance of the coils is negligible (in other words, the only voltage across
a coil is the induced voltage given by Faraday), is simply the ratio of the number of turns
4.
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A transformer uses iron to make sure that all the magnetic flux passing through the primary ("sending") coil also goes through the secondary ("receiving") coil. Use Faradays Law to show that the ratio of the voltages on the primary and the secondary assuming the resistance of the coils is negligible (in other words, the only voltage across a coil is the induced voltage given by Faraday), is simply the ratio of the number of turns 4.

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of wire in the primary and secondary. (Hint-it is probably easiest to work backwards:
start with the notion of the flux to calculate the voltage on each coil.) If a 12 V
transformer for your portable CD player has 100 turns of wire on the 120 V coil, how
many turns are on the secondary (12 V side)?
help_outline

Image Transcriptionclose

of wire in the primary and secondary. (Hint-it is probably easiest to work backwards: start with the notion of the flux to calculate the voltage on each coil.) If a 12 V transformer for your portable CD player has 100 turns of wire on the 120 V coil, how many turns are on the secondary (12 V side)?

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Expert Answer

Step 1
From faraday's law of induction, the induced output voltage from the
secondary coil is given by
ΔΦ
At
From faraday's law of induction, the induced input voltage from the
primary coil is given by
ΔΦ
[2]
At
Divide equation [1]by [2]
ΔΦ
-N
At
ΔΦ
-Np
At
VP
V N
13]
help_outline

Image Transcriptionclose

From faraday's law of induction, the induced output voltage from the secondary coil is given by ΔΦ At From faraday's law of induction, the induced input voltage from the primary coil is given by ΔΦ [2] At Divide equation [1]by [2] ΔΦ -N At ΔΦ -Np At VP V N 13]

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