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When we quote average power, we do so because often on a mains feeder the power to various loads fluctuates a bit, so we work out the real power Vrms x Irms for a resistive load (more complex for non linear and L or C loads) and average this every second or so, in the digital realm you might compute the real power every 20mS (16.666mS in the US) and keep a running average of this on a per second basis.
What else can I help you with?
How does a isolating transformer work?
Isolation transformers are used to isolate one circuit from another. Highly sensitive circuits may require isolation from high power circuits, for example.
What is lpf and upf wattmeters?
LPF (Low Power Factor) and UPF (Unity Power Factor) wattmeters are instruments used to measure electrical power in AC circuits. LPF wattmeters are designed for circuits with low power factor, where the phase difference between voltage and current is significant, while UPF wattmeters are used for circuits operating at or near unity power factor, where the voltage and current are in phase. The choice between the two depends on the power factor of the system being measured, as each type provides accurate readings under its respective conditions.
How is magnetic reluctance measured?
Magnetic reluctance is a concept used in the analysis of magnetic circuits. The term was coined in May 1888. There are several methods to determine the magnetic characteristics.
What is the need of frequency in electrical power?
Transformers are used in AC circuits and won't work for DC. A frequency of 60Hz is popular in the USA.
Why capacitor is used in tube light circuit?
For power factor improvement so that the KVA demand is reduced.
How is electricity distributed to lights and power sockets?
It depends where you live.In most countries, radial circuits are used for both power and lighting circuit.In the UK, ring-main circuits are used for power circuits, while radial circuits are used for lighting circuits.
What happen to the apparent power if the DC excitation is reduced?
'Apparent power' is a term used in a.c. circuits, NOT d.c. circuits.
What name is used for a high-power circuits?
Sir!
What type of capacitor is often used in power-supply circuits to filter the rectified AC?
The electrolytic capacitor is most often used in power supply circuits to filter the rectified AC.
Why auto transformers are not used directly on dc circuits?
Transformers are not used on DC circuits because they rely on a varying magnetic field to transform power.
What are Advantages Circuits used for?
Advantages Circuits are used for a number of purposes. They are used in industrial control circuit boards and in devices such as battery chargers, neon modules and power supplies.
Why chokes are used in electrical circuits?
commonly with a single dc power source to isolate ac loads from other parts of the circuits. in dc power supplies to remove ripple
Is it common for the hot wire to be used in electrical circuits?
Yes, it is common for the hot wire to be used in electrical circuits to carry the current from the power source to the electrical devices.
Why leds are used instead of bulb in circuits?
Smaller Longer Lifespan/More reliable Less power used
How does a constant current power supply works?
these are essential for circuits which are current sensitive, it regulates the amount of current which serves as protection for circuits. it is commonly used in Laser diode applications.
How does a isolating transformer work?
Isolation transformers are used to isolate one circuit from another. Highly sensitive circuits may require isolation from high power circuits, for example.
Can parallel circuits be used instead of fuses?
No. Parallel circuits are not fuses. Fuses can be used to protect parallel circuits.
