Understanding AC Transformer Principles

avatar
Created by
Rebecca Robinson

Cards (64)

  • What can transformers do with voltage levels?
    Step up or step down voltage
  • What is a transformer?
    A device that changes AC voltage
  • Why are Step-Down transformers used for household appliances?
    They reduce voltage for safe usage
  • How does a transformer operate?
    It uses electromagnetic induction
  • What is the main purpose of a transformer?
    To step up or step down voltage
  • What is the key principle behind transformers?
    Electromagnetic induction
  • What does the voltage ratio in a transformer equal?
    Turns ratio
  • What happens when the primary coil current changes in a transformer?
    It creates a varying magnetic field
  • What does the changing magnetic field in a transformer induce?
    A voltage in the secondary coil
  • What induces a voltage in the secondary coil of a transformer?
    A varying magnetic field in the iron core
  • How does the number of turns in each coil affect a transformer's function?
    It determines whether voltage is stepped up or down
  • How do Step-Up transformers differ from Step-Down transformers in terms of turns?
    Step-Up has fewer primary turns
  • What process produces output voltage in a transformer?
    Electromagnetic induction
  • What does Faraday's law state about a changing magnetic field?
    It generates a voltage in a coil
  • How does the iron core affect the transformer’s efficiency?
    It helps concentrate the magnetic field
  • What is the role of the iron core in a transformer?
    It enhances the magnetic field
  • What is the relationship between the primary and secondary coils in a transformer?
    The primary coil receives input, secondary produces output
  • What is the primary function of a Step-Down transformer?
    Decreases voltage
  • What law is the process of electromagnetic induction in transformers based on?
    Faraday's law
  • What are the two types of transformers and their functions?
    • Step-Up: Increases voltage
    • Step-Down: Decreases voltage
  • Where is the input voltage applied in a transformer?
    In the primary coil
  • Why are Step-Up transformers used for long-distance transmission?
    They boost voltage for efficient transmission
  • What is the formula relating primary and secondary voltages in a transformer?
    V<sub>p</sub>/V<sub>s</sub> = N<sub>p</sub>/N<sub>s</sub>
  • If V<sub>p</sub> = 120V, N<sub>p</sub> = 500 turns, and N<sub>s</sub> = 1000 turns, what is V<sub>s</sub>?
    V<sub>s</sub> = 240V
  • Where is the output voltage produced in a transformer?
    In the secondary coil
  • What material are the coils of a transformer wrapped around?
    Iron core
  • How do Step-Down transformers differ from Step-Up transformers in terms of turns?
    Step-Down has more primary turns
  • What is the relationship between primary and secondary voltages and turns in a transformer?
    • Voltage ratio equals turns ratio
    • Formula: V<sub>p</sub>/V<sub>s</sub> = N<sub>p</sub>/N<sub>s</sub>
    • Use proportionality to calculate unknowns
  • What is a step-down transformer?
    A transformer where the secondary voltage (V<sub>s</sub>) is less than the primary voltage (V<sub>p</sub>) because the number of secondary turns (N<sub>s</sub>) is less than the number of primary turns (N<sub>p</sub>)
  • What does the formula V<sub>p</sub>/V<sub>s</sub> = N<sub>p</sub>/N<sub>s</sub> signify?
    The voltage ratio equals the turns ratio
  • What is a step-up transformer?
    A transformer where the secondary voltage (V<sub>s</sub>) is greater than the primary voltage (V<sub>p</sub>) because the number of secondary turns (N<sub>s</sub>) is greater than the number of primary turns (N<sub>p</sub>)
  • What is the relationship between the voltage ratio and turns ratio in a transformer?
    The voltage ratio equals the turns ratio, given by V<sub>p</sub>/V<sub>s</sub> = N<sub>p</sub>/N<sub>s</sub>
  • What are the key differences between step-up and step-down transformers?
    • Step-up transformer: N<sub>s</sub> > N<sub>p</sub>, V<sub>s</sub> > V<sub>p</sub>
    • Step-down transformer: N<sub>s</sub> < N<sub>p</sub>, V<sub>s</sub> < V<sub>p</sub>
    • To calculate V<sub>s</sub> for step-up: Multiply V<sub>p</sub> by turns ratio
    • To calculate V<sub>s</sub> for step-down: Divide V<sub>p</sub> by turns ratio
  • What is the formula for the voltage ratio in a transformer?
    V<sub>p</sub>/V<sub>s</sub> = N<sub>p</sub>/N<sub>s</sub>
  • What are the applications of step-up and step-down transformers?
    • Step-Up Transformers:
    • Increases voltage
    • Applications: Power transmission
    • Step-Down Transformers:
    • Decreases voltage
    • Applications: Household appliances, industrial equipment
  • If a transformer has 100 primary turns and 500 secondary turns, what is the voltage ratio?
    0.2
  • What is the difference in function between step-up and step-down transformers?
    Step-up increases voltage; step-down decreases voltage
  • How can you calculate V<sub>s</sub> using the given voltages and turns?
    V<sub>s</sub> = (V<sub>p</sub> × N<sub>s</sub>)/N<sub>p</sub>
  • What are the key differences between Step-Up and Step-Down transformers?
    • Step-Up:
    • Increases voltage
    • Fewer primary turns, more secondary turns
    • Step-Down:
    • Decreases voltage
    • More primary turns, fewer secondary turns
  • What is the primary function of step-down transformers?
    Lower voltage for household appliances