AC Source & Phasor
v(t) = V₀ sin(ωt). Rotating phasor projects onto sine wave. V_rms = V₀/√2.
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Complete revision notes and formulas for Alternating Current (Class 12). Curated for JEE, NEET, AP Physics, SAT, and CUET. Tap any topic to open the live simulation and full PYQ set.
v(t) = V₀ sin(ωt). Rotating phasor projects onto sine wave. V_rms = V₀/√2.
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I in phase with V (φ = 0°). I₀ = V₀/R.
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I lags V by 90°. X_L = ωL grows with frequency.
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I leads V by 90°. X_C = 1/(ωC) falls with frequency.
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Z = √(R² + (X_L − X_C)²). Phasor + impedance triangle live.
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I peaks at f₀ = 1/(2π√LC). Q-factor and bandwidth Δf = f₀/Q.
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P_avg = V_rms·I_rms·cosφ. Watch p(t) = v·i and the average line.
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q(t) = q₀cos(ω₀t). Energy bounces between capacitor and inductor.
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V_s/V_p = N_s/N_p. Step-up vs step-down with animated flux in core.
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ε(t) = NBAω sin(ωt). Rotating coil between magnetic poles.
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X_L (linear ↑) and X_C (1/f ↓) crossing at resonance frequency f₀.
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V_rms = V₀/√2 — DC equivalent for power. Mains 230 V is RMS, peak 325 V.
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Vector sum: V = √(V_R² + (V_L − V_C)²). Tune each and see V_net.
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Alternating Current on sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs). Free physics revision for Class 12, JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT Subject Physics, and CUET-UG.