Before indulging ourselves into the advantages and disadvantages of AC Motor
over DC Motor, well need to outline a brief elaboration of both systems. Direct
current (DC) is the kind of current that flows on a conductor in an invariant
way; this means they do not change their intensity in the course of time.
Alternating Current (AC) on the other hand behaves in the opposite way. The
intensity of the current changes as time passes due to the change of direction
of electric charges change direction of circulation in the conductor period.
Direct Current
For a period of time this current intensity remains constant throughout a
period, this type of current has both merits and its demerits we are going to
list below.
Alternating Current
Whenever the current intensity changes with time, the intensity varies from
maximum positive value on a graph to maximum negative value, in this case, the
graph can take any form of wave whereby the form is not any restriction as long
as this is maintained throughout the entire period. It is very important to make
sure that all energy from storage devices such as a battery is transferred as
direct current whereas the energy coming from the hydroelectric plant and
reaching the plugs of our environs is transmitted as alternating current. Let us
look go to the advantages and disadvantages of these systems.
Alternating Current Characteristics And Advantages
1. AC transportation is highly economical than continuous, the cost of
reducing or raising AC voltage is less than DC Voltage (refer to DC Motors /
Gleichstrommotoren). This is the reason as to why hydroelectric power plants
deliver power to our homes. It is important to raise the voltage at some points
and then to lower it at reaching our homes.
2. The wide range of voltages obtained by the use of the transformer
3. The machines that use alternating current are much robust and do not
require much repair and maintenance during use.
4. The alternating current is perceptible to quick conversions into direct
current by using rectifiers
5. The alternating current transmission on long distances lowers the line
losses as compared to direct current
Direct Current — Advantages Over Alternating Current
1. High insulation is required for the maximum value of alternating current
since it is very dangerous.
2. Direct current usually emits electric shock that repels the human body
while alternating current attracts the body of whoever touches it directly.
3. At low voltages, electricity can be transmitted through wires since they
are less resistant to direct current.
4. Direct current can be stored in batteries, which is one of the greatest
advantages of direct current over alternating current.
5. DC is adequately safer than AC.
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