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Test

Transformers

bryonycribbb 11 preguntas

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Preguntas del test (11)

  1. 1How is potential difference induced across the ends of a conductor?
    1. AWhen an electrical conductor "cuts" through a magnetic field
    2. BWhen an electrical current "cuts" through a magnetic field
    3. CWhen an electrical conductor "cuts" through the potential difference
  2. 2What happens when a magnet is moved into a coil of wire?
    1. APotential difference is induced across the ends of an electrical conductor
    2. BPotential difference is induced across the ends of the coil
    3. CPotential difference is induced across the ends of the iron
  3. 3Explain the structure of a step up transformer
    1. AMore turns on the secondary coil than the primary coil
    2. BPotential difference across the primary coil is greater than secondary coil
    3. CPotential difference across the secondary coil is greater than the primary coil
    4. DMore turns on the primary coil than the secondary coil
  4. 4Describe the structure of a step-down transformer
    1. ATurns on the primary coil are greater than the turns on the secondary coil
    2. BTurns on the secondary coil are greater than the turns on the primary coil
    3. CPotential difference across the secondary coil is greater than the primary coil
    4. DPotential difference across the primary coil is greater than the secondary coil
  5. 5What is a current measured in?
    1. AVolts / V
    2. BAmperes / Amps
    3. CNewton metres / Nm
  6. 6Switch mode transformers are suitable for mobile phone chargers
    1. AVerdadero
    2. BFalso
  7. 7Switch mode transformers operate at high frequencies. Between what?
    1. A50kHz - 200 kHz
    2. B25kHz - 250 kHz
    3. C50kHz - 250kHz
  8. 8Which of these statements are true
    1. ASwitch mode transformers use very little power when turned on
    2. BStep-up transformers have a higher potential difference across the primary coil
    3. C"I" stands for current
    4. DSecondary coils are on the left hand side of a diagram
  9. 9Potential difference across the primary and secondary coils can be measured by which following equation
    1. AVp np
      ----- = -----
      Vs ns
    2. BVp x Vs = np x ns
    3. CVp Ip
      ---- = -----
      Vs Is
  10. 10Equation that can masure the electrical input / output of a transformer
    1. AVp x Vs = np x ns
    2. BVp x Ip = Vs x Is
    3. CVp x Vs = Ip x Is

Información

Descripción
GCSE (Physics) Triple Science Test sobre Transformers, creado por bryonycribbb el 04/05/2015.
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