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Tuesday, 27 October 2015

Comparison between ac and dc

comparison between ac and dc,difference between ac and dc,alternate current ,direct current,
Electricity – DC and AC
DC stands for Direct Current.
In DC, electrons flow only in one direction.
AC stands for Alternating Current.

In AC, electrons change direction periodically.
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DC Power
A battery provides DC power by producing direct current in a circuit because each terminal of a battery always has the same sign: the positive terminal is always positive and the negative terminal is always negative. Electrons move from the repelling negative terminal toward the attracting positive terminal, always moving through the circuit in the same direction.
DC and AC  Voltage
Every battery is designed to produce only one voltage.
DC voltage cannot travel very far until it begins to lose energy.
AC is safer to transfer over longer city distances.
AC can provide more power
AC Power and AC Voltage
Generators provide AC power.
AC voltage  from a generator can be stepped up or down by means of a device 
called a transformer.
Throughout the world, most residential and commercial circuits are AC because
 electric energy in the form of AC can easily be stepped up to high voltage for 
long-distance transmission with small heat losses, then stepped down to 
convenient voltages where the energy is consumed.

Power Transmission

Almost all electric energy sold today is in AC form because of the 

ease with  which it can be transformed from one voltage to another.
Large currents in wires produce heat and energy losses , so power is 
transmitted great distances at high voltages and correspondingly low
 currents.
This is because Power = voltage x current.
Power is generated at 25, 000 volts or less and is stepped up near


 the  power station to as much as 750,000 volts for long-



distance transmission, then stepped down in stages at 



substations and distribution points to voltages needed in 



industrial applications 
(often 440 volts or more) and for homes(240 and 120 volts).
AC Applications
Stationary AC Applications
qHospitals
qHotels
qResidence use
qPower plants
qMilitary applications
qIsolated rural areas
DC Applications

Enclosed Environments
q Space vehicles
q Underwater vehicles (submarines)
q Space Station
Transportation
q  Public transportation
Personal vehicles(Zero emission Vehicles)
Commercial and Military vehicles



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