AC peak and RMS
RMS is the DC-equivalent heating value for a resistor. It is not the mean voltage of a symmetric sinusoid, whose mean over a whole cycle is zero.
Run this experiment →Physics · Class 12
Alternating Current
7 free physics experiments and lesson notes for Alternating Current, with model limits, worked examples and Tamil explanations.
Reactance, impedance and phasors
Inductor reactance grows with frequency; capacitor reactance falls. Their signed difference determines phase, and the resistor sets the in-phase component.
Run this experiment →Series LCR resonance
Near resonance, inductive and capacitive reactances cancel. Resistance limits the current and controls peak width; small resistance makes a sharper resonance.
Run this experiment →Power factor and reactive current
Voltage and current out of phase exchange energy with L and C. Their reactive components do not contribute net energy over a whole cycle; R consumes real power.
Run this experiment →AC generator
Rotating the coil changes its projected area in the magnetic field. Faster rotation raises both output frequency and peak EMF. Maximum flux occurs when instantaneous EMF is zero.
Run this experiment →Transformer turns ratio
A transformer uses changing shared flux. Raising voltage reduces available current for a given transmitted power. Efficiency accounts for a lumped input-power loss.
Run this experiment →LCR response to DC and AC
Compare AC steady-state frequency response with switched DC subcircuits. The DC selector explicitly chooses RC, LR or ideal LC; it is not a full damped second-order LCR transient solver.
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