Alternating Current (AC) Basics
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Questions and Answers

The primary winding in a transformer is connected to the ____________.

  • Output load
  • Secondary winding
  • Ground connection
  • Power source (correct)

    • The secondary winding in a transformer is connected to the ____________.

  • Primary winding
  • Power source
  • Ground connection
  • Load that requires voltage (correct)

    • What is the definition of frequency?

  • The voltage opposing the current flow.
  • The resistance of a conductor.
  • The capacitance of a capacitor.
  • The number of cycles per second. (correct)

    • What is the formula to determine the voltage across the secondary winding (ES) of a transformer?

    <p>ES = VP (NS / NP)</p> Signup and view all the answers

    What unit measures capacitance?

    <p>Farad</p> Signup and view all the answers

    What is the purpose of using isolation transformers?

    <p>To isolate circuits for safety</p> Signup and view all the answers

    Isolation transformers are wound so that their primary and secondary voltages are ____________.

    <p>Equal</p> Signup and view all the answers

    Which of the following describes inductance?

    <p>The creation of voltage due to changing currents.</p> Signup and view all the answers

    If the maximum induced voltage is 230V, what is the voltage at a phase angle of 90°?

    <p>0V</p> Signup and view all the answers

    How is the period of a waveform related to frequency?

    <p>Period is the reciprocal of frequency.</p> Signup and view all the answers

    What is the peak-to-peak voltage for a sine wave with a peak voltage of 120V?

    <p>240V</p> Signup and view all the answers

    What is the frequency of a sine wave that repeats ten times in 0.6 seconds?

    <p>16.67 Hz</p> Signup and view all the answers

    What formula defines frequency?

    <p>f = 1/T</p> Signup and view all the answers

    What is the average value of a sine wave with a peak voltage of 120V?

    <p>76.8V</p> Signup and view all the answers

    What is the root-mean-square (rms) value for a sine wave with a peak voltage of 240V?

    <p>169.7V</p> Signup and view all the answers

    How is a sine waveform produced?

    <p>Using an oscillator</p> Signup and view all the answers

    In a resistive AC circuit, the relationship between voltage and current is:

    <p>Both peak at the same time</p> Signup and view all the answers

    What is the symbol for inductance?

    <p>L</p> Signup and view all the answers

    Which of the following factors affects inductance?

    <p>All of the above</p> Signup and view all the answers

    What is the inductive reactance formula?

    <p>$X_L = 2 rac{pi f L}$</p> Signup and view all the answers

    In an inductive AC circuit, how does the current relate to voltage?

    <p>Current lags voltage by 90°</p> Signup and view all the answers

    What is the formula for calculating the equivalent capacitance of capacitors connected in series?

    <p>$C_{eq} = \frac{1}{\frac{1}{C_1} + \frac{1}{C_2} + \frac{1}{C_3}}$</p> Signup and view all the answers

    What is the unit of measurement for capacitive reactance?

    <p>Ohms</p> Signup and view all the answers

    What is the symbol for capacitive reactance?

    <p>X_C</p> Signup and view all the answers

    At what phase angle does the current lead the voltage in a capacitive AC circuit?

    <p>90°</p> Signup and view all the answers

    What type of power represents the actual power consumed in an AC circuit?

    <p>Real power</p> Signup and view all the answers

    Which of the following represents the formula for reactive power?

    <p>Q = V imes I imes \sin(\phi)</p> Signup and view all the answers

    In a parallel RLC circuit, how does the voltage across components compare?

    <p>It is equal across all components.</p> Signup and view all the answers

    What is the basic action of a transformer?

    <p>Transforming voltage levels</p> Signup and view all the answers

    Study Notes

    Alternating Current (AC)

    • Alternating current (AC) is electric current that reverses direction periodically.
    • Frequency is the number of cycles per second of alternating current.
    • One hertz (Hz) is one cycle per second.
    • Capacitance is the storage of electricity in a capacitor. The unit of measurement is farads (F) or microfarads (µF).
    • Inductance is the opposition to current change. The unit is henries (H).
    • A time varying current creates a voltage.

    Induced Voltage

    • The induced voltage (E) at different phase angles (θ) can be calculated when the maximum induced voltage (Emax) is known.
    • For example, if Emax = 230V, at 0°, E = 230V; 45°, E = 163V; 90°, E = 0V; 180°, E = -230V.

    Key AC Parameters

    • Frequency (f):
    • Symbol: f
    • Unit of measurement: Hertz (Hz)
    • Formula: (Not given in the provided text.)
    • Period (T):
    • Symbol: T
    • Unit of measurement: Seconds (s)
    • Formula: T = 1/f

    Calculating Frequency

    • Frequency (f) = (number of cycles)/(time in seconds)
    • Example: 10 cycles in 0.6 seconds, f = 10 / 0.6 = 16.67 Hz

    Sine Wave Properties

    • Peak Voltage: Highest voltage in one direction.
    • Peak-to-Peak Voltage: Voltage difference between positive and negative peaks.
    • Average Value: (Not given in text.)
    • Root Mean Square (RMS) Voltage: (Not given in text.)

    Transformer Components

    • Primary winding: The side connected to the input voltage.
    • Secondary winding: The side connected to the load.

    Transformer Types

    • Isolation transformers.
    • Potential transformers.

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    Related Documents

    26201 Alternating Current Setwork PDF

    Description

    This quiz covers fundamental concepts of Alternating Current (AC), including its characteristics, frequency, capacitance, and inductance. It also explores induced voltage and key parameters essential for understanding AC circuits. Test your knowledge on these vital electrical concepts!

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