Flashcards on Alternating current
Alternating Current Explained: Principles, Circuits, and FAQs
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36 cards
Card 1
Question: What is the primary difference between direct current (DC) and alternating current (AC)?
Answer: Direct current flows in only one direction, while alternating current periodically reverses its direction of flow.
Card 2
Question: What is a key advantage of alternating current (AC) over direct current (DC) for long-distance power transmission?
Answer: AC's ability to be easily transformed to different voltage levels is a key advantage over DC for long-distance power transmission.
Card 3
Question: How is alternating voltage primarily generated?
Answer: Alternating voltage is primarily generated by electromagnetic induction, which involves the relative motion between a conductor and a magnetic field.
Card 4
Question: What is an AC generator also known as?
Answer: An AC generator is also known as an alternator.
Card 5
Question: Explain how an alternator generates alternating voltage.
Answer: In an alternator, a coil of wire rotates within a uniform magnetic field. As the coil rotates, the magnetic flux passing through it changes, inducing
Card 6
Question: What is the formula for instantaneous voltage in a sinusoidal AC circuit?
Answer: u = U_max·sin(ωt + φ)
Card 7
Question: What is the formula for instantaneous current in a sinusoidal AC circuit?
Answer: i = I_max·sin(ωt + φ)
Card 8
Question: In the formula u = U_max·sin(ωt + φ), what do 'u' and 'U_max' represent?
Answer: `u` is the instantaneous voltage and `U_max` is the peak (maximum) voltage.
Card 9
Question: What does 'ω' (omega) represent in the sinusoidal AC waveform equations?
Answer: `ω` is the angular frequency, measured in radians per second (rad/s).
Card 10
Question: What does 'φ' (phi) represent in the sinusoidal AC waveform equations?
Answer: `φ` is the initial phase angle, measured in radians (rad), indicating the phase of the waveform at t = 0.