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In long range,electric current can flow only when the wires are given high voltage.The voltage is about 20-30kV.eg.lightning. ---------------------------------------- Current of any voltage can flow in a wire. However, the larger the current is, the larger the resistance to flow and the greater the loss of energy during transmission. Therefore, to transfer the same amount of energy per second (power) without as much loss of energy due to resistance, current needs to be lowered by increasing the voltage since Power = Current * Voltage.
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Why can no machine or device convert all the energy available to it into useful work?
Not quite true ... I give you the electric heater.All the power in comes out as heat.The problem with everything else is that there is always losses due to friction and/or hysteresis that becomes heat - lost heat because it is not the desired output.
How many watts is 6 amps?
The formula is P = E x I. Power in watts (P) is equal to the product of the voltage (E) and the current (I). The total power used at 6 amps and 120 volts is equal to 720 watts. If the voltage was 240 volts, the total power would be 240 volts times 6 amps, or 1440 watts.
What is voltage what is another name for votage?
What is voltage what is another name for voltage? That is potential difference. In physics, the potential difference or p.d. between two points is the amount of work that would need to be done on a unit electric charge to move it from one point to the other against an electric field. P.d. is synonymous with voltage and is measured in volts. http://en.wikipedia.org/wiki/Potential_difference http://en.wikipedia.org/wiki/Voltage Cheers ebs
Need 7 sentences for the word power?
The storm took our power out.They power the emergency equipment with an on-site generator.You need a power sander for that job.Tyrone Power never won an Academy Award.He has the power to get the legislation passed.They power washed the entire pool area for the party.We're from American Falls in Power County Idaho.
2. Explain how to focus a microscope using the high power lens. Include any safety issues you need to be aware of.?
In order to focus a high powered lens, you have to turn the knob using the scanning lens. Then rotate the high powered lens. But you must be careful as to not turn the knob so much that it cracks the slide because then you have to clean a glassy mess.
How electrical power is transmitted from power plan to the consumer?
electrical power from the power plant to consumer goes through the transmission & distribution system, first we transmit the high voltage power from the power plant to sub station in sub station we step down the voltage according to need & distribute it to the demand.
For what are high voltage power supplies typically used for?
High voltage power supplies have many uses. It is most commonly used to supply power from a device to the circuit. These are great for people who need to supply their house with power.
What is the need for generating high voltages in laboratories?
we generate high voltage (DC,AC or Impuse) purposely for insulation testing of various components in power systems. Physics labs need high voltage to accelerate subatomic particles.
How do i fine an expression for power that involves only current and voltage?
You do not need ohm's law to relate power to current and voltage. Power is current times voltage. If you know current and voltage, you do not need to know resistance.
When do you need to convert the voltage for appliances?
You need to convert the voltage if your appliance requires less voltage than you power supply. example: appliances is 110V and power supply is 220V.
What does a hydroelectric power station need to function?
In order for a hydroelectic power station to function, the station will need a large supply of water. The station will also require large generators with turbines in order to create power from the pressure of the water.
What is a output voltage?
You can compare a power supply to a waterfall of energy. The high of the waterfall is the output voltage, and the quantity of water in the river is the current intensity. The power generate is a combination of the intensity and the voltage: P=UI (the effective power is the result of the multiplication of the voltage and the intensity). That explain why higher the voltage is, less intensity is needed to have the same power. It is the same in a waterfall, higher it is, less water you need to make a mill turning.
How do you measure the current and voltage in high tension line?
To measure high voltage use suitable instrument transformer (potential transformer) Very carefully. It can kill you. The higher the voltage the more the danger or arcing over even when two conductors are not touching. Voltage meters are rated and the rating should not be exceeded. Depending on the voltage you will need the proper meter and a high voltage probe rated for the voltage you are measuring. If you don't know what you are doing, don't mess with high voltage. Leave to the pros.
What is Core in a Transformers?
It steps down voltage by moving the iron core spacing. Mostly using on high current welding transformer. Easy to achieve changing output voltageand does not need to use high power selector to switch voltage
Would an hp laptop work in Australia due to their high voltage?
No - you would need to buy a suitable adaptor for Australia's power system.
Why do amplifiers have high voltage gain?
If you got a microphone that converts soft acoustic waves to audio voltage, the low output must be amplified. For that purpose it is good to have an amplifier with high voltage gain. The same is needed for the output of your CD player before it goes to the power amp. Scroll down to related links and look at "Amplification". Many amplifiers do not need high voltage gain. The final output stage of a good power amplifier usually has high current gain but very low voltage gain. Amplifiers are also used as mixers and filters where there is no voltage gain.
Why During transmission of power it is transformed as high voltage rather than high current how is this possible as current and voltage are directly proportional?
Voltage and current are actually inversely proportional to one another. The formula P=IV is what you need to look at here, where P is Power, V is voltage, and I is current. Rearranging the equation you will see that V = P/I. You can see that if you increase voltage, while holding power constant, current is reduced. Now, to your question. The losses on a transmission line are proportional to the current flowing on the line, so transmitting at high voltage (and hence low current) is beneficial as it reduces the amount of power that is lost due to resistance in the line itself.
