In AC, voltage transformation to higher(and also lower) values is easier at constant power. So, voltage is increased before transmission reducing current and hence reducing transmission losses.
Why is AC preferred over DC for long distance transmission?
Answer: Ac is more preferred than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transimission. When fault occurs it is easy to interrupt ac supply.
Why is AC preferred over DC?
One of the biggest advantages of AC over DC is that it is relatively cheap to change the voltage of any current. It is also best suited for transporting electrical current over long distances when compared to DC, as energy losses are considerably reduced.
Is DC transmission better than AC?
At same voltage, the DC transmission line has less stress as compared to the AC transmission line. Hence, DC requires the less insulation as compared to AC. The communication line interference is more in the AC transmission line as compared to the DC transmission line.
What is the advantage of AC over DC electrical transmission?
(i) The generation of AC is cheaper than that of DC. (ii) When AC is supplied at higher voltages, the transmission losses are small compared to DC transmission. (iii) AC can easily be converted into DC with the help of rectifiers.
Why DC current is not used in homes?
Large transformers are used to run transmission lines at high voltages in order to keep losses to a minimum. But high voltage is dangerous, particularly to life, so bringing it into a house would not be an acceptable risk. … DC arcs do not “quench” as easily (because voltage does not go through zero).
Why AC is dangerous than DC?
Alternating current (A.C) is five times more dangerous than Direct current (D.C). The frequency of the alternating current is the main reason for this severe effect on the human body. The frequency of 60 cycles is in an extremely harmful range. At this frequency, even a small voltage of 25 volts can kill a person.
Which choice defines AC and DC correctly?
In AC, electrons moving in one direction. In DC, they move in one direction and then in the other direction. In DC, electrons move in only one direction.20 мая 2017 г.
Why do we use AC current?
Alternating current describes the flow of charge that changes direction periodically. As a result, the voltage level also reverses along with the current. AC is used to deliver power to houses, office buildings, etc.
What are the advantages of DC current?
The biggest advantage of DC electricity is that it is easier to store than AC electricity, especially on a small scale. Storing electricity when it is made, for use later when it is needed, is a critical concept for a hybrid independent power plant.
Can DC current kill you?
The current may, if it is high enough and is delivered at sufficient voltage, cause tissue damage or fibrillation which can cause cardiac arrest; more than 30 mA of AC (rms, 60 Hz) or 300 – 500 mA of DC at high voltage can cause fibrillation.
What are the pros and cons of AC and DC transmission?
In AC transmission system, the power can be transmitted for long distance and in DC transmisson system, the losses are low. We use AC transmission in now a days transmission that is higher currents and it have 50hz frequency and low impedance. d.c in power lose is more but ac in power lose is less ..
Which is safer AC or DC?
An electric shock has the capacity to induce ventricular fibrillation which can lead to heart failure and death. Avoiding any form of electric shock is preferable, but DC is considered safer in these circumstances as the human body’s threshold to DC is considerably higher than to AC.
What is the advantage of AC power transmission?
Other advantage of ac system is that electrical power can be generated at high voltages easily and maintenance of ac substation is cheaper and easier. Distribution of ac system is undoubtedly superior to that of a dc system as in the ac system voltage control is easy by means of transformers.
Why AC power is used for distribution?
Distribution and Domestic Power Supply. Alternating Current is used for electric power distribution because it can easily be transformed to a higher or lower voltage. Electrical energy losses are dependent on current flow. … Three voltage waveforms are generated that are 120 degrees out of phase with each other.