Electrical and Electronics

Alternating current may be defined as the current whose magnitude and phase changes with time. So, we can alternating current as: According to above figures we can  have four basic types of alternating currents i.e. sinusoidal and non-sinusoidal alternating currents. Non-sinusoidal sine wave includes triangular, square and saw tooth alternating currents. The image below shows a sinusoidal alternating current Sinusoidal Alternating Current Terminologies in AC: Cycle: An alternating current starts from zero, reaches to positive maximum value. Then it attains negative maximum after crossing zero and then again reaches zero from where it will again attain the positive value. When AC starts from zero, attains maximum value and then again reaches zero, this is known as positive half cycle. Now from the zero of end of positive half cycle its value again starts increasing but this magnitude is negative. It attains the negative maximum value and then again attains th