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Power transmission by AC or DC always uses high currents, but maybe you are questioning why a DC system used very high currents.
Imagine a DC system supplying a few streets at 200 volts, each house draws a current and the total current for the locality is found by adding the currents. Maybe it's 1000 amps. That is the same with AC.
Now suppose several localities are supplied, each drawing 1000 amps. With a DC system the total currents still add up so there might be many thousands of amps to be supplied, needing very thick wire.
But is it's an AC supply, each locality could have its own transformer supplied from a high voltage supply like 11,000 volts. So instead of many thousands of amps, the high-voltage supply might only have to carry 100 amps on relatively thin wire.
The difference between AC and DC is that Transformers cannot be used on DC supplies.
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∙ 11y ago
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How does an ac power source differ from a dc power source?
AC power sources are the adapter power sources. DC power sources are the direct power sources. DC stands for direct current, meaning it is a direct source of energy., and AC stands for alternating current, which means it is a secondary source of power.
How electricity travels through power cords?
It's called Alternating Current (AC) as opposed to Direct Current (DC/batteries).
Battery ac or DC?
A battery supplies DC.
Current in cars ac or DC?
The Current in a automobile is DC, you have a battery which is dc, and your alternator produces ac current but converts it to DC inside the alternator unit which gives your battery DC power. So basically everything in your car is DC.
What is the power factor of a DC system?
It would be unity, or 1.0. Since the voltage in a DC circuit does not vary with time, there can be no phase displacement of the current waveform, and therefore the current could not lead or lag the voltage waveform.
Why is not impractical to power distribution in power DC?
IN DC FOR LOW VOLTAGE HIGH DENSITY OF CURRENT WILL BE THERE SO WE CAN NOT USE THIS FOR BEST PRACTICE FOR TRANSMISSION & ALSO BECOS OF HIGH CURRENT TRANSMISSION LOSSES ARE VERY HIGH ( I2XR) LOSSES, TRANSMISSIN EQUIPMENT FOR DC ARE HIGH COSTIN DC FOR LOW VOLTAGE HIGH DENSITY OF CURRENT WILL BE THERE SO WE CAN NOT USE THIS FOR BEST PRACTICE FOR TRANSMISSION & ALSO BECOS OF HIGH CURRENT TRANSMISSION LOSSES ARE VERY HIGH ( I2XR) LOSSES, TRANSMISSIN EQUIPMENT FOR DC ARE HIGH COSTAnswerThe main reason is that we cannot use transformers to easily and efficiently change the magnitude of DC voltages, and the ability to change voltages is essential for electricity distribution. However, having said that, very high-voltage transmission over exceptionally long distances is often done using DC. This is because DC losses are far lower than AC losses.
Do you get DC current directly from the transmission line?
Only if it is a DC transmission line.
What is longest High Voltage electric transmission line in the US?
Pacific DC Intertie, a 500KV direct-current power line from The Dalles, Oregon to Los Angeles.
Why do we use AC supply in our homes?
The power transmission would require bigger wires to transmit high dc current so instead high voltage ac current is transmitted through long distance linesTo reduce losses it is necessary for the value of current through lines to be lowTranformers donot work for dc current so one cant step up and step down dc current voltage like it can be done with ac current
What IS AC power and DC power?
AC Power is Alternating Current whereas DC Power is Direct Current.
Can you run power windows on a DC current?
Power windows ONLY run on DC current.
What is system of operation?
HVDC system is electric power transmission system to transmit bulk power over long distances with High DC voltage and current. The operation of HVDC system means the transmissing power from generating source to load destinaton.
What is operation of HVDC system?
HVDC system is electric power transmission system to transmit bulk power over long distances with High DC voltage and current. The operation of HVDC system means the transmissing power from generating source to load destinaton.
How do you change DC to ac current?
Dc current can be changed to Ac current by using an undulator.Wrong!The devices that change DC to AC are:an electronic power invertera mechanical motor-generator set (only used in very high power stationary applications)an electromechanical vibrator (now obsolete)
Full form of DC power supply?
DC Power is Direct Current Power Supply.
How do you write a persuasive speech about why DC current is better than AC?
I think you would have a problem with that since a transformer won't work on DC and the power transmission boys would have a fit.
Why AC current is transmitted from power station instead of DC current?
This was due to the results of the War of the Currents between Edison, who supported DC and Tesla for AC power distribution. Although most electronics you find today run off DC power, the transmission of DC power over long distances is not very efficient and requires several substations between the power transmission source and where it is received. AC power after stepped up can be transmission over long distances with little energy loss. The energy loss occurs from heat generated from resistance within the transmission wire. At the introduction of Edison's system, there was no practical AC motor available. It was primary due to the introduction of the 3 phase AC motor did AC finally win over DC.
