AC FUNDAMENTALS

1. ALTERNATIVE VOLTAGE :-A voltage that changes its polarity and magnitude at regular intervals of time is called an advertisement voltage

 2. SINUSOIDAL ALTERNATIVE QUANTITY-- An alternative quantity which varies according to sine of angle wt is known as sinusoidal alternative quantity

 3. GENERATION OF ALTERNATIVE VOLTAGE AND CURRENT-- An alternative voltage can be generated either
a)by rotating a coil in a uniform magnetic field at constant speed
b)by rotating a uniform magnetic field within a stationary coil at a constant speed.


4. Equation of alternative EMF and CURRENT









5. IMPORTANT TERMS--
a) waveform
b) instantaneous value
c) cycle
d) Alternation
e) Time period
f) Frequency
g) Amplitude

6. IMPORTANT RELATIONS--
a) Relation between frequency and time period
b) Realtion between frequency and angular velocity

 7. Different forms of alternative voltage equation

 8. Values of alternative voltage and current

 9. Peak value-- The maximum value attained by an alternative quantity during one cycle is called its peak value