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Transformer

Transformer. AC Source. Alternating current comes from generators, not batteries. Ideal sinusoidal source The symbol for an AC source uses a sine curve. R. D V. Faraday’s law links flux to voltage. Change in voltage to change in flux Change in flux to change in voltage

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Transformer

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  1. Transformer

  2. AC Source • Alternating current comes from generators, not batteries. • Ideal sinusoidal source • The symbol for an AC source uses a sine curve. R DV

  3. Faraday’s law links flux to voltage. Change in voltage to change in flux Change in flux to change in voltage The flux can link one conductor to another. Iron for better flux link Minimize losses Internal Flux

  4. An AC voltage source produces a changing voltage. The changing voltage creates an opposing magnetic flux in the iron. Primary Coil

  5. Faraday’s law describes the induced voltage in the second coil. Assume all field lines from primary go through secondary The induced voltage directly depends on the primary voltage. Secondary Coil

  6. The output voltage depends on the ratio of the turns in the coils. Symbol represents linked coils If NB > NA then the voltage increases. Step-up transformer If NB < NA then the voltage decreases. Step-down transformer Turns Ratio

  7. Commercial transformers wind two coils around a linkng medium. Single cylinder of air or iron Connecting bar of iron The schematic symbol represents two coils. Transformers

  8. An AC adaptor is an example of a step-down transformer. Convert 120 V AC to 18 V DC Power transmission uses step-up up and step-down transformers. Power plant: 10 kV to 345 kV Substation: 345 kV to 7200 V Power pole: 7200 V to 120 V AC Adapter

  9. Transformers do not create power. Energy conserved Losses small compared to resistors For no power loss, current and voltage must maintain same power. Current decrease for step-up Current increase for step-down Power Law next

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