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. ... The voltage can also be stepped down again so it is safe for domestic supply.
Why is AC preferred for long distance transmission?
When fault occurs it is easy to interrupt ac supply. Answer: With increase in voltage,line current is reduced for transmitting same power to long distance . ... Hence, AC is preferred over DC for intermidoiate length transmission.
How is AC power distributed?
There is no definite line between transmission and distribution according to voltage or bulk capacity. However, in general, the a.c. distribution system is the electrical system between the step-down substation fed by the transmission system and the consumers’ meters .
Why is AC used in the national grid?
Electric power is normally generated, transmitted and distributed as alternating current (AC). AC power is well suited to efficient transmission and distribution , as the voltage can be increased or reduced by transformers.
What is the advantage of AC power transmission?
AC power transmission is cheaper and more efficient in voltage stepping using transformers . This leads to efficient electrical energy transmission through power lines. This efficient transmission helps power companies and the consumer to save lots of money.
Why DC current is not used in homes?
Direct current is not used at home because for the same value of the voltage, DC is more lethal than AC since direct current does not go through zero . Electrolytic corrosion is more an issue with direct current. DC inductors are more complicated. It requires commutators, electronic switches and brushes.
What is the main advantage of AC over DC?
Key Advantages of AC over DC
The AC is simpler to produce than DC. It is also less expensive than DC to generate . The AC systems have higher efficiency than DC such as ac generators. The waste of power is negligible for AC during transmission.
Which is more efficient AC or DC?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
What are advantages and disadvantages 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 ..
Why AC current is used in homes?
Because high voltages are more efficient for sending electricity over long distances , AC has an advantage over DC. This is because the high voltages from the power plant for home use can be easily reduced to a safer voltage. The voltage is changed with a transformer.
Is AC safer than DC?
A.C. is said to be four to five times more dangerous than D.C. For one thing, A.C. causes more severe muscular contractions. ... The frequency of the AC has a lot to do with the effect on the human body. Unfortunately, 60 cycles is in the most harmful range. At this frequency, as little as 25 volts can kill.
Which current is used in home?
Alternating current (AC) electricity is the category of electricity usually used in homes and businesses. Direct current (DC) means the unidirectional stream of electric charge. Most of the digital electronics use DC.
Why there is no loss of energy in AC?
Answer: If a resistance is used in an a.c. circuit, a part of electrical energy is lost in the form of heat. Instead, if we use an inductance, there is no energy loss in the form of heat because power factor for inductive component is zero . ... So, its resistance is large for a.c. than for d.c.
Why AC is cheaper than DC?
Now the choice for AC or DC will depend on the cost of equipment needed to increase and decrease voltage level. As the transformer and related equipment for AC are cheaper compared to boosters and converters for DC, AC supply system is less expensive and accepted world wide.
What is the difference between AC and DC voltage?
Both AC and DC describe types of current flow in a circuit. In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically.
Are batteries AC or DC?
Batteries and electronic devices like TVs, computers and DVD players use DC electricity – once an AC current enters a device, it’s converted to DC. A typical battery supplies around 1.5 volts of DC.
