Comparison between ac and dc
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October 27, 2015 |
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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.
•DC stands for Direct Current.
•In DC, electrons flow only in one direction.
•AC stands for Alternating Current.
•In AC, electrons change direction periodically.
click here to download this file
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
q Personal vehicles(Zero emission Vehicles)
q Commercial and Military vehicles
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