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PHYS 102

PHYS 102. Where. T is the period of oscillation. PHYS 102. Transformers: One symbol used to denote a transformer is:. PHYS 102. Transformers: Looks like two solenoids in close proximity to one another. Called step-up transformer. Called step-down transformer. PHYS 102. Transformers:.

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PHYS 102

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  1. AC Circuits PHYS 102 Where T is the period of oscillation.

  2. AC Circuits PHYS 102 Transformers: One symbol used to denote a transformer is:

  3. AC Circuits PHYS 102 Transformers: Looks like two solenoids in close proximity to one another.

  4. AC Circuits Called step-up transformer Called step-down transformer PHYS 102 Transformers: If primary current is alternating in time, then the magnetic flux in transformer core is changing! Induced EMF VP= NP(Induced EMF); VS= NS(Induced EMF); same induced EMF

  5. AC Circuits PHYS 102 Transformers: Remember: Power input must equal power output (Always)

  6. AC Circuits PHYS 102 Transformers: Have we all seen a transformer?

  7. AC Circuits PHYS 102 How do the other circuit elements behave under the influence of an AC source? Remember, everything in the past has been analyzed with a DC source.

  8. AC Circuits PHYS 102 Resistors: We say that the current is “in phase” with the driving voltage.

  9. AC Circuits PHYS 102 Capacitors: We say that the current is “out of phase” with the driving voltage. Current in a capacitor leads the voltage by 90o.

  10. AC Circuits PHYS 102 Capacitors: Since the sine function has a maximum value of 1, we could define a peak current. Resembles current through resistor. XC is called the “reactance” of a capacitor. Units = Ohms. The slower the frequency the greater the capacitive reactance. Low frequencies→ capacitor acts like open circuit. High frequencies→ capacitor acts like short circuit.

  11. AC Circuits PHYS 102 Capacitors: XC is not the same as Resistance because no power is dissipated through a capacitor. Current leads driving voltage: it takes current to move charge on the capacitor plates→current must flow before the voltage can change significantly.

  12. AC Circuits PHYS 102 Inductors: We say that the inductor current is “out of phase” with the driving voltage. Current in an inductor lags behind the voltage by 90o.

  13. AC Circuits PHYS 102 Inductors: XL is called the “reactance” of an inductor. Units = Ohms. The greater the frequency the greater the inductive reactance. Low frequencies→ inductor acts like short circuit. High frequencies→ inductor acts like open circuit.

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