Chapter-7|Alternating Current |NCERT 12th Physics: Resonance in L-C-R Circuit: In LCR circuit, when phase(Ø) between current and voltage is zero, the circuit is said to be resonant circuit. Power in AC Circuit: We know that, V= V₀Sinωt applied to a series LCR circuit drives a current in the circuit.
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Chapter-7|Alternating Current |NCERT 12th Physics: AC Voltage Applied to a Series LCR Circuit: Let an inductor(L), a capacitor (C) and resistance (R) are connected in series to an AC source.
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Chapter-7|Alternating Current |NCERT 12th Physics: AC Voltage Applied to a Capacitor: Let a capacitor with capacitance C be connected to an AC source with EMF Due to this EMF, charge will be produced and it will charge the plate of capacitor with positive and negative charge. If potential difference across the plates of capacitor is
Chapter-7|Alternating Current |NCERT 12th Physics: AC Voltage Applied to an Inductor: Let an inductor with self inductance(L) is connected to an AC source with instantaneous EMF (V) which is given by V= V₀Sinωt Applying Kirchhoff’s law, Net potential across the circuit will be zero Phase difference: Phase angle
Chapter-7|Alternating Current |NCERT 12th Physics: AC Voltage Applied to a Resistor: Let a resistor of resistance R is connected to an AC source of EMF with instantaneous value V, which is given by V= V₀Sinωt Or (E= E₀Sinωt) Comparing I₀= V₀/R with Ohm’s law, we find that registers work equally well for
Chapter-7|Alternating Current |NCERT 12th Physics: Root Mean Square(RMS) Value of AC: It is defined as the value of AC over a complete cycle which would generate same amount of heat in a given register that is generated by steady(DC) current in the same register and in the same time during a complete cycle. Derivation: We
Chapter-7|Alternating Current |NCERT 12th Physics: Mean or Average Value of AC: It is defined as the value of AC, which would send same amount of charge through a circuit in half cycle that is send by steady current(DC) in the same time (i.e T/2) through the same circuit. Note: We cannot calculate average value of
Chapter-7|Alternating Current | NCERT 12th Physics: Alternating Current: If the direction of current changes alternatively and its magnitude changes continuously with respect to time is called alternating current. Alternating current changes continuously between zero and maximum value and flows in one direction in the first half cycle and in the opposite direction in the next
Chapter-6|Electromagnetic Induction (EMI)| NCERT 12th Physics: AC Generator: AC generator is a kind of device that produces electrical energy from mechanical work. Principle: An AC generator is based on the phenomenon of electromagnetic induction, which is state that whenever magnetic flux linked with a conductor or coil changes an EMF is induced in the coil.
Chapter-6|Electromagnetic Induction (EMI)| NCERT 12th Physics: Mutual Inductance: The phenomenon according to which an opposing EMF is produced in a primary coil as a result of change in current or magnetic flux linked with a neighbouring coil is called mutual induction. If I₁ is changing, then B in primary coil also changes, B in secondary
