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Which transformer raises the voltage high and lower the current for transmission?
Wiki User
∙ 13y ago
A step-up transformer.
Wiki User
∙ 13y ago
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What does a transformer convert?
A transformer transforms one level of voltage and current into another. A step up transformer raises voltage and lowers current, usually to make long power lines more efficient, and a step down transformer raises current and lowers voltage, usually to make it safe for homes and appliances.There are other more specialized transformers as well. Isolation transformers provide galvanic (DC) isolation between primary and secondary. They may step the voltage up or down, or not, as needed. Current transformers, used as part of an instrumentation system, transform high current flow in a conductor (feeding a load, such as a motor), to a lower current, usually 5 amperes full scale. They are usefull when very large currents must be measured.Another AnswerIt is incorrect to say that a step-up transformer 'transforms voltage up, and current down' or that a step-down transformer 'steps voltage down, and current up'. This suggests that the primary current determines the secondary current, which it most-definitely doesn't! The value of the current in a transformer's primary winding is determined by the load, so the load determines the value of the secondary current which, in turn, determines the value of the primary current.
What does a step up and a step down transformer do?
It raises the voltage of the output of the main generator to the level of the grid transmission lines. The actual values depend on the design of the plant and grid system. In the UK the generator output would typically be about 23 kV and the grid line at 400 kV. Very high voltages make transmission of power more economical because the current is correspondingly reduced.
Is it true that a resistor raises the voltage across its terminals as current flows through it?
It depends on how you choose to define current and polarity...The normal convention is that current flows from positive to negative, even though that is not true. It is simply a convention, making it easier to analyze a circuit and to not have to deal with negative numbers. In this convention, the terminal of the resistor that current is flowing into will be more positive than the other terminal.The accepted reality is that current flows from negative to positive. In that convention, the terminal of the resistor that current is flowing into will be more negative than the other terminal.It does not really matter which convention you use, so long are you are consistent in the application of the convention and in the treatment of signs.Thank you, so it is not true, right?Another AnswerNo, it is not true. In order for current to pass through a resistor, there must be a potential difference across its ends. The magnitude of the current depends on the value of the potential difference. So a larger current is the result of a larger potential difference, NOT the other way around.The same applies to 'voltage drops'. Voltage drops are not the result of a current passing through resistors in series; voltage drops are necessary for the current to flow through each resistor.
Why do you connect a capacitor panel to the load?
Capacitors are sometimes connected in parallel to inductive loads to improve the power factor, raising the voltage of the source AC. Power factor is the ratio of apparent power over true power. It is 1, if the load is purely resistive, such as in a toaster, but it is less than 1 if the load is reactive, such as in a motor. This is because current is not in phase with voltage in that case. Inductive loads cause the current to lag voltage, and capacitive loads cause the current to lead voltage. Placing capacitors across an inductive load tends to compensate for the lagging power factor. Specifically, power factor is the cosine of the phase angle between voltage and current. In an ideal situation, with perfect sources, conductors, and reactive loads, the phase angle would be plus (capacitive) or minus (inductive) 90 degrees, and the power factor would be zero. This means that a conventional watt meter would register zero but, in reality, energy is still being supplied, and that has to be accounted for. In practical terms, since conductors have impedance, a poor power factor degrades voltage so, adding capacitors raises voltage.
Effect of under voltage on induction motor?
if it is a three phase motor it can be run an the single phase mains but it woild require a hand start in either direction, if you put a capacitor on line two and three and the live and neutral on line one and two then it should work
What device raises voltage?
Depending on your application... Use a voltage dividor (two resistors) if it doesn't draw a lot of current. You could also try a voltage regulator or using an op amp as a buffer, with the input the voltage you want. That voltage could come from a voltage divider, since op amps draw extremely low current.
What does a transformer convert?
A transformer transforms one level of voltage and current into another. A step up transformer raises voltage and lowers current, usually to make long power lines more efficient, and a step down transformer raises current and lowers voltage, usually to make it safe for homes and appliances.There are other more specialized transformers as well. Isolation transformers provide galvanic (DC) isolation between primary and secondary. They may step the voltage up or down, or not, as needed. Current transformers, used as part of an instrumentation system, transform high current flow in a conductor (feeding a load, such as a motor), to a lower current, usually 5 amperes full scale. They are usefull when very large currents must be measured.Another AnswerIt is incorrect to say that a step-up transformer 'transforms voltage up, and current down' or that a step-down transformer 'steps voltage down, and current up'. This suggests that the primary current determines the secondary current, which it most-definitely doesn't! The value of the current in a transformer's primary winding is determined by the load, so the load determines the value of the secondary current which, in turn, determines the value of the primary current.
What does a step up and a step down transformer do?
It raises the voltage of the output of the main generator to the level of the grid transmission lines. The actual values depend on the design of the plant and grid system. In the UK the generator output would typically be about 23 kV and the grid line at 400 kV. Very high voltages make transmission of power more economical because the current is correspondingly reduced.
What is the difference between a transformer and a rectifierwhich are found in a PC power supply?
The rectifier is what changes your AC into DC that the computer can use. Transformer raises or lowers the voltage. So you have 110 volts AC coming into your computers power supply. The Rectifier circuit in there changes the AC voltage to DC voltage but it is still to high for the computer use. The transformer lowers that voltage down to the various voltages that your computer needs
What happen to the power if current and voltage both are doubled?
The current is doubled.I = V/RI=2V/RLets assign arbitrary numbers to voltage and resistance to evaluate what happens. Voltage will be 8 volts and resistance will be 2 ohms.I = 8/2 Therefore current = 4ampsIf voltage is doubled then,I =2(8)/2I=16/2I = 8 amps
What is difference between electronic and electrical?
flow of current through conductor called electrical ( example - copper, aluminum ) flow of current through semi conductor called electronics ( example - silicon, germanium ) Electronics also includes use of vacuum tubes and other technologies that can amplify and/or modulate signals. Electrical circuits lack the ability to amplify or modulate (note: a transformer that steps up voltage is not amplifying as there is power lost that cannot be made up; an electronic amplifier that raises the signal's voltage does not cause loss of power in the output signal as it can take power from its power supply as needed, it may even raise the signal power as well as voltage).
What a transformer is?
Transformation are nothing but changing the image in to different forms by 1)scaling 2)translation 3)rotation scaling:increasing the size of the actual image translation:moving image from one position to another position rotation:changing the angle of image and yaw
Reduces the size on the tex and raises it to the top of the current line?
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Serial connection definition?
This connection goes from negative 2 positive which raises the voltage. Thanks!! o.o
Why does a cars ignition system need a transformer to work?
I'm not sure what you mean by transformer. A transformer is used to change one voltage to another, and the only transformer in a simple ignition system I can think of would be the coil. Since most cars run on 12 volts delivered from a battery, and that is not nearly enough to ignite a spark in a car's cylinder, the coil raises that voltage to around 50,000. I've described the transformer in a very basic ignition system. Today's cars use very sophisticated ignition systems using variations of what I just described in order to increase power and give better mileage. By using electronics to shorten the duration of the spark a set of sparkplugs can last 100,000 miles or more and modern cars no longer use "points" that can also wear out. Still, something has to increase that 12 volts to get a good spark.
What is meant by excitation of a generation?
In a generator there should be residual magnetism to start the voltage production . However maintaining the voltage level is a little more complicated because of drift when loads are applied to the unit. to overcome some of the problems an exciter coil section produces a voltage at a know level. that level used as a reference to increase or lower the output of the main generator. Onan YD units have an output of approximately 24volts if the voltage lags the current by 10% it raises the exciter voltage to offset the lagging voltage. Most generators has an AVR (automatic voltage regulator) that will more closely hold frequency (a function of rpm) voltage and current at an even load. without some excitation the generation process would wonder up and down seeking a midpoint but fluctuating wildly with every output request.
Is it true that a resistor raises the voltage across its terminals as current flows through it?
It depends on how you choose to define current and polarity...The normal convention is that current flows from positive to negative, even though that is not true. It is simply a convention, making it easier to analyze a circuit and to not have to deal with negative numbers. In this convention, the terminal of the resistor that current is flowing into will be more positive than the other terminal.The accepted reality is that current flows from negative to positive. In that convention, the terminal of the resistor that current is flowing into will be more negative than the other terminal.It does not really matter which convention you use, so long are you are consistent in the application of the convention and in the treatment of signs.Thank you, so it is not true, right?Another AnswerNo, it is not true. In order for current to pass through a resistor, there must be a potential difference across its ends. The magnitude of the current depends on the value of the potential difference. So a larger current is the result of a larger potential difference, NOT the other way around.The same applies to 'voltage drops'. Voltage drops are not the result of a current passing through resistors in series; voltage drops are necessary for the current to flow through each resistor.
