Chapter-7|Alternating Current |NCERT 12th Physics: Transformer: It is a device which is used to increase or decrease the alternating voltage. The Transformer are two types (I) Step-Up transformer – Increase voltage (II) Step-down transformer – Decrease voltage Construction: It consists of large number of laminated soft iron cores. There are two types of winding one […]
Chapter-7|Alternating Current |NCERT 12th Physics: Energy Stored in an Inductor: When in inductor(L), current(I) is applied, the magnetic flux will be developed.
Chapter-7|Alternating Current |NCERT 12th Physics: L-C Oscillations: When a capacitor is supplied with AC current, it gets charged When this charged capacitor is connected with an inductor, current flows through inductor, giving rise to magnetic flux. Hence, induced EMF is produced in this circuit. Due to this, the charge of the capacitor decreases and an
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
