Peak, Average, and RMS Values of AC and Voltage Peak value: - The maximum instantaneous value of a quantity over a complete cycle. - For alternating curr...
Peak value:
The maximum instantaneous value of a quantity over a complete cycle.
For alternating current (AC), the peak value corresponds to the maximum voltage experienced by a device in an AC circuit.
For a specific voltage, the peak value depends on the connected device and the circuit's specifications.
Average value:
The average value of a quantity over a complete cycle is its sum divided by the cycle length.
For AC, the average value is simply the voltage during a complete cycle.
It represents the typical and predictable value of a voltage in an AC circuit.
RMS (root-mean-square) value:
The RMS value, also known as the effective or root-mean-square value, is the square root of the average of the squared values of a quantity over a complete cycle.
For AC, the RMS value of a voltage is equal to the square root of the average of the squares of the instantaneous voltage values.
It represents a measure of the average "root-mean-square voltage" experienced by a device in an AC circuit.
Examples:
A voltage source with a peak voltage of 120 V and a frequency of 60 Hz has a peak value of 120 V.
The average voltage for a DC power supply is typically 12 V.
The RMS voltage of a voltage in a circuit with a 120 V peak voltage and a resistance of 10 ohms is equal to 14.14 V.
Additional notes:
The RMS value is a more useful parameter for analyzing the behavior of devices in AC circuits, as it is not affected by the phase angle of the voltage.
The peak and average values can differ for different devices and circuits, depending on the specific conditions and how they are connected