Phase representation of vector like voltage or current vector and Phase angle

Voltage and current exist in two forms, Direct Current (DC) and Aleternate Current (AC). For DC the voltage and current maintain the same value as fucntion of time, because there is no changing voltage or current. ************************* Please like and subscribe ************************* In AC, the voltage and current keep changing, between Mazimum, Zero and Minimum and back to Zero and Maxximum and so on... The frequency of DC is zero. The frequency of AC depends on how often the AC cycle repeates ever second (or per unit time). For example the AC wave that repeates the same cycle 60 time in one second (60 cycles per second) is said to have a frequency of 60 Hertz. Phase is a way of representing the variable Voltage as function of time V(t) or Currnet as function of time I(t). Phase Angle is the shift, or difference, in time between two signals (Voltage or Current) or at time it is the difference bwteen some signal (Voltage or Current as function of time) and the reference angle, usually it is 0 degree. When the Current I(t) is ahead of voltage I(t) then we say that the current leads the voltage, and vise versa. Each vector (voltage or current as function of time) have magnetude and angle, the magnetude is the value of this variable when it is at Maximum level, and the angle is the value of the phase shift (phase delay) at certain instant in time, because it keeps changing over time. If the voltage at certain time is 90 degrees relative to the zero reference angle then we know that the voltage is at the maximum level. See video for more details. Different cases may present different possibilities depending on the circuit under testing. ===

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