Alternating Current Concepts

   Tuesday, August 11, 2020   

Alternating Current Concepts include all Definitions, Laws, Diagrams, Rules, Examples, Results etc.

Page 1

Advantages of AC over DC | Amplitude of an alternating current | Define and calculate the time period and frequency of an alternating current | Alternating current | Calculate root mean square value of alternating current | Phasor Diagram | Rms current for a purely resistive circuit | Rms voltage for a purely resistive circuit | Instantaneous and average power | Voltage and current in same phase for a purely resistive circuit

Page 2

Phasor Diagram for a resistive circuit | Current through a resistor when AC voltage is applied | Inductive reactance | Phasor Diagram for a inductive circuit | Instantaneous and average power for an inductive circuit | Explain the magnetisation and demagnetisation of an inductor on application of AC | Current through a inductor when AC voltage is applied | Capacitive reactance | Phasor Diagram for a capacitive circuit | Instantaneous and average power for an capacitive circuit

Page 3

Explain the charging and discharging of a capacitor on application of AC | Current through a capacitor when AC voltage is applied | Current in AC circuit containing resistance and inductance | Current across inductor does not change suddenly | Inductor as an open circuit during switching | Inductor as an short circuit | Differential equation of a LR circuit for growing current | Differential equation of a LR circuit for decaying current | Time constant in an LR circuit | General Solution of Differential Equation for an Inductor in LR circuit

Page 4

General solution of a differential equation for a resistor in LR circuit | Voltage in a growing LR circuit | Current in a growing/decaying RL circuit | Energy stored in an inductor in an LR circuit | Calculate amount of heat generated in resistors in LR circuits | Calculate potential difference when the current in the circuit is maximum | Current in AC circuit containing resistance and capacitance

Page 5

Similarity between electrical and mechanical oscillations | Natural frequency in LC circuit | Charge variation in an LC circuit | Charge Across Inductor/Capacitor in a LC circuit | Find energy stored across inductor/capacitor at a given time instant in a LC circuit | Problem on Energy in LC oscillation | Basic problems on LC oscillations | Analogies between mechanical and electrical oscillations

Page 6

Problems on LCR circuits excited by an AC source | Impedance of an AC circuit | Instantaneous current through LCR circuit | Phasor relations for various circuit components | Impedance diagram | Phasor-Diagram Solution for an LCR circuit | Understand the analytical solution (differential equation) for an LCR circuit | Current in AC circuit containing capacitance and inductance

Page 7

Identify if given circuit is inductive or capacitive | Understand and find the general solution as sum of transient and steady-state solution of a RC/RL/LCR circuit | Problems on superposition in AC circuits | Natural frequency for resonance in a series RLC circuits | Solving problem based on resonant frequency for an RLC circuit | Impedance at resonance | Current at resonance | Calculating current and impedance at resonance | Applications of resonance circuits | No resonance in RL or RC circuits

Page 8

Instantaneous power in an LCR circuit | Average power in an LCR circuit | Resonance in LC circuit | Sharpness of resonance | Half power points of resonance | Bandwidth of resonance circuits | Quality factor | Quality factor and its relevance with selectivity | Comparison of power dissipated in various circuits | Wattless Current | Power factor