Summary of Factor de potencia BIEN EXPLICADO | coseno de fi | activa | reactiva | aparente

00:00:00 - 00:10:00

This video explains the factor of power, which is the relationship between the active power and the reactive power in an electric circuit. The factor of power is determined by the coseno of fi, which is the angle between the voltage and current in the circuit. A coseno of fi less than 0.8 is considered a bad factor of power.

• 00:00:00 The Factor of Power is a concept that is both of electricity and electronics, and is one of the more difficult to understand concepts. In this video, we will see it explained in three different ways, so that by the end everyone understands it. The Factor of Power relates three types of power: the active power, the reactive power, and the apparent power. First, we will discuss what these three things are. The active power is the power that any electric device uses while operating. This power is extracted from an electric circuit and is called the "active" power because it is different from the second type of power we will discuss. Reactive power is the power that is moving within a circuit that is being fed with alternating current. When an electric device is working, it is extracting energy from the circuit at a rate of two per second. This power is known as the "reactive" power because it is moving back into the circuit. Apparent power is the power that is moving within a circuit that is fed with alternating current, and is equal to the sum of the active and reactive power. However, this is only true in an alternating current circuit, where our magnitude is doubled.
• 00:05:00 In this video, four examples of waves are demonstrated. The first is a voltage applied to a resistance which is then passed by an amperage. The voltage and current values are small, so to calculate effective values we need to use peak values. I have attached a video link to a video explaining the effective value. In the second example, a resistance is fed by a current and a voltage. The current and voltage are both sinusoidal, and the resistance is always positive. The current and voltage waves are always in phase, and the voltage that the resistance dissipates is the sum of the two waves. The power dissipated by the resistance is plotted on a graph as a sinusoidal wave with a double frequency of the input current. In the third example, a coil of wire is shown. The wire can accumulate energy in its interior, and this causes the current to flow 90 degrees behind the voltage. The power dissipated by the resistance is plotted as a sinusoidal wave with a double frequency of the input current. In the fourth example, a load that is partly active and partly passive is demonstrated. This could be a motor. The current and voltage waves are both 45 degrees behind the resistance. If the resistance were
• 00:10:00 This triángulo is used to calculate electrical power. The horizontal axis is for the power (vatios) and the vertical axis for the frequency (volti-amperios). The factor of power is the coseno of that angle: the coseno of fi. If the angle is 90 degrees, there is no reactive power and the coseno of fi would be one. If the angle is outside of 90 degrees, there is reactive power and all power would be active. The coseno of fi is important because it tells us the relationship between the active power and the reactive power. It depends on what we are doing, but in general, a coseno of fi less than 0.8 is a bad factor. This triángulo corresponds to an inductive load, which is why the reactive power factor points upwards on the vertical axis, if it were a capacitive load the factor would point downwards.