Which
is better, alternating current or direct current? Back in the 1880s, that
question generated an all-out current war between two geniuses. On the one
side, Thomas Edison pushed that direct current was safer and would cause less
hazard of electrocution. However, it proved to be cheaper and easier to
transmit the power of alternating current over long distances. This was the
stance of Edison's competitor, Nikola Tesla.
More Power
Probably the biggest advantage of
AC over DC is that you can generate much more power from AC than DC.
Alternating current is generated by large turbines. Direct current normally
comes from batteries or sometimes from solar panels. Solar panels large enough
to power entire cities would take huge amounts of land. Batteries use chemical
reactions to produce electricity. Producing a huge battery would be expensive
and impractical. Large turbines can be easily built and powered using steam,
nuclear or hydraulic power.
Long Distance Transmission
The ability
to generate higher voltages with AC translates into the ability to transmit
that power over longer distances. Alternating current is generated at power
stations and transmitted through power lines to substations that can boost AC
and keep it going farther distances.
Conversion
In some
operations, direct current may be preferred. However, it is easy to convert AC
to DC by using simple transformers. It is much more difficult and costly to
convert DC to AC.
Alternating Current in the Home
One of the
reasons that AC is better than DC in the home is that AC can be stepped up or
down using transformers. On the other hand, when using DC, the power supply
must match the load it powers. If you have a 120 volt lamp, then you need a 120
volt battery. If the battery is 240 volts, then the voltage can be reduced
using a resistor, but, that would waste half the voltage.
Commercial Advantages
Another
advantage of the use of alternating current lies in manufacturing and other
production facilities that drive the economy. Electric motors are used to drive
conveyors and other equipment. The advantages of the AC motor are that they can
yield a higher output of horsepower than DC motors and they are simpler in
function than a DC motor. Also, transformers allow AC to be stepped up or down
where it is needed to drive different sized motors.
What Is the Difference Between AC
& DC Electricity?
It includes
all basic difference.
The
Advantages & Disadvantages of AC and Dc
AC may be
better for one application, while DC may be better for another. Engineers need
to Take various
aspects of a particular application into account to decide between the two.
VOLTAGE Transformation
A big advantage that AC electricity has over DC electricity is that it can be easily transformed from a high voltage level to a low voltage level using a device known as a transformer. The cables used to transmit electricity over long distances resist that flow, so high voltages have to be used to push the electricity along them. These voltages would be dangerously high if they came into homes or business environments, so transformers are used to lower the voltage of the electricity before it is delivered to the end user. In the United States, electricity is delivered to end users at 120 volts.]
Reactance
When
electricity flows down a cable, it generates an electromagnetic field. When
the current changes, as it does with AC current, a counter electro-magnetic
field is produced that acts as a resistance to the power being transmitted.
These means that AC transmission of electricity loses power due to both
resistance and to reactance. Because DC power transmission never changes
direction, it is not susceptible to power loss as a result of reactance.
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