chopficaro said:power=P+P(cos(2wt))+Q(cos(2wt))
but
complex power = P+jQ
am i to assume that complex power is a phasor representation of the last two terms? why does this formula ignore the first term?
Complex power, denoted as S, is a measurement of the total power in an AC circuit. It includes both the real power, P, which is the power consumed by the circuit, and the reactive power, Q, which is the power stored and released by the circuit. Real power is the actual power used to perform work, while reactive power is the power that oscillates between the source and load without being consumed.
To calculate complex power, you can use the formula S=P+jQ, where P is the real power and Q is the reactive power. Simply substitute the values for P and Q into the formula to find the complex power.
The j in the formula represents the imaginary unit, which is used in complex numbers to denote values on the imaginary axis. In the context of complex power, it represents the reactive power, which is measured in units of volts-ampere reactive (VAR).
Yes, complex power can be negative. This occurs when the reactive power is larger than the real power, which means that the circuit is producing more power than it is consuming. In this case, the negative sign indicates that the power is flowing in the opposite direction.
Complex power is used in various applications in electrical engineering, such as power system analysis and design. It is also used in power factor correction, where reactive power is minimized to improve the efficiency of a circuit. Additionally, complex power is used in the measurement and control of power in AC circuits.