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A bridge rectifier is supply with 120Vrms sinusoidal signal each diode has a junction voltage of 0.3V determine the peak votage?
Wiki User
∙ 14y ago
v peak = v rms Times Square root (2)
Note: A junction voltage of 0.3V is atypical. Normally a silicon diode has a forward voltage between 0.6 volts to 1.4V depending on current. Are you sure about the forward voltage? Perhaps you are talking about germanium or schottky diodes?
Wiki User
∙ 14y ago
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How many degrees of current flow is there in a sine wave?
If you have V = 120Vrms Cos(2*pi*60t + 120). The magnatude of the voltage is 120Vrms. The frequency is 60Hz. The phase shift is 120. That would be the voltage that comes out of a standard American household eletrical outlet. The current would depend on what is plugged into the outlet. A general equation would be VmCos(w*t + theta) or ImCos(w*t + theta) for current. To use a Sine wave, just do a 90 degree phase shift. (sin(t) = cos(t-90) or cos(t) = sin(t+90))
What are the advantages of three phase to single phase electric power distribution systems?
This Answer is the same as the for the Question 'Why is power for a country's mains grid usually generated as 3-phase electricity not single phase?'Single phase power has a sine wave voltage that crosses zero before reversing its polarity. In the region near the zero-crossing there is not much power. At zero there is none at all. So single phase loads often need some trickery to deliver output in this area. Often it is just the inertia of the motor or appliance.Three phase power is always delivering power on one of its phases, and is thus preferred for machines, motors and appliances that use lots of power.Three phase power generation is preferred if the application needs very high power, or nees relatively small power output but with with weight restrictions - as in automobiles, where the power is generated in a 3-phase alternator and then converted to DC using rectifiers!Use of DC (Direct Current) is the next step up for smooth high-power devices but requires rectification, regulation and smoothing to be useful.Another problem with DC is that, for efficient long distance transmission, it cannot be simply converted to much higher voltages than the voltage at which it was generated at the power station.Similarly DC cannot - simply by using transformers - be converted down to safer, much lower AC mains voltages for use by consumers.Conversion of DC to AC requires the use of expensive high-power electronic "power inverter" systems and the opposite - the conversion of high-power AC to DC - requires the use of very big power rectifiers.AC (Alternating Current) is used for high power generation and distribution because it can easily be transformed, using transformers, to achieve very efficient power transmission over very long distances and can then be transformed down to low voltages for distribution to consumers.Two phase, and higher multi-phases are also used, but very rarely, for a few very specialised applications.A three phase system provides constant torque, whereas single phase does not.With three phase you will get more power per kilogram of metal to generate electrical energy.AnswerFor a given load, a three-phase supply uses less copper than a single-phase system. In other words, it's more economical!
What is the ampacity of the power bright vc100w power converter at 120vrms?
.833Amps I (Amps)= P(Watts) / E(Volts) I=Current P=Power E=electro
Is 120vac the same as 120vrms?
No. RMS is the the true heating ability of A.C. RMS means root mean square. That is the square root of two divided by 2 equals 0.707. Multiply the A.C. times 0.707 equals RMS.
Convert rms to peak to peak power?
P-P voltage = RMS voltage * 2 * sqrt (2)Here's an example: house voltage is 120VRMS, which is actually ~169 volts peak - neutral. double this will give peak to peak value.
How many degrees of current flow is there in a sine wave?
If you have V = 120Vrms Cos(2*pi*60t + 120). The magnatude of the voltage is 120Vrms. The frequency is 60Hz. The phase shift is 120. That would be the voltage that comes out of a standard American household eletrical outlet. The current would depend on what is plugged into the outlet. A general equation would be VmCos(w*t + theta) or ImCos(w*t + theta) for current. To use a Sine wave, just do a 90 degree phase shift. (sin(t) = cos(t-90) or cos(t) = sin(t+90))
If you have a transformer with 140 turns on the primary side and 8 turns on the secondary With 120Vrms across the primary side what is the voltage across the secondary side?
Output from secondary is about 6.8V rms, on no load. On the primary side, you have 140 / 120 = .86 volts per turn. Therefore, on the secondary side you will have 8*.86 = 6.8 volts.
If you have a transformer with 140 turns on the primary side and 8 turns on the secondary. With 120Vrms across the primary side what is the voltage across the secondary side?
Output from secondary is about 6.8V rms, on no load. On the primary side, you have 140 / 120 = .86 volts per turn. Therefore, on the secondary side you will have 8*.86 = 6.8 volts.
A lamp draws a current of 0.5 a when 120 V is applied across it What is the power rating of the lamp?
I assume this is for an AC system. 110-120Vrms (typical wall socket voltage) = 155-170V sine wave peak to 0 volts. Similar for the current you gave - I assume it is in RMS? In an AC system, 120Vrms * .5Arms = 60Watts If the values you have are measured peak to 0 volts, Wattage = 1/2 * Voltage * Current
What are the advantages of three phase to single phase electric power distribution systems?
This Answer is the same as the for the Question 'Why is power for a country's mains grid usually generated as 3-phase electricity not single phase?'Single phase power has a sine wave voltage that crosses zero before reversing its polarity. In the region near the zero-crossing there is not much power. At zero there is none at all. So single phase loads often need some trickery to deliver output in this area. Often it is just the inertia of the motor or appliance.Three phase power is always delivering power on one of its phases, and is thus preferred for machines, motors and appliances that use lots of power.Three phase power generation is preferred if the application needs very high power, or nees relatively small power output but with with weight restrictions - as in automobiles, where the power is generated in a 3-phase alternator and then converted to DC using rectifiers!Use of DC (Direct Current) is the next step up for smooth high-power devices but requires rectification, regulation and smoothing to be useful.Another problem with DC is that, for efficient long distance transmission, it cannot be simply converted to much higher voltages than the voltage at which it was generated at the power station.Similarly DC cannot - simply by using transformers - be converted down to safer, much lower AC mains voltages for use by consumers.Conversion of DC to AC requires the use of expensive high-power electronic "power inverter" systems and the opposite - the conversion of high-power AC to DC - requires the use of very big power rectifiers.AC (Alternating Current) is used for high power generation and distribution because it can easily be transformed, using transformers, to achieve very efficient power transmission over very long distances and can then be transformed down to low voltages for distribution to consumers.Two phase, and higher multi-phases are also used, but very rarely, for a few very specialised applications.A three phase system provides constant torque, whereas single phase does not.With three phase you will get more power per kilogram of metal to generate electrical energy.AnswerFor a given load, a three-phase supply uses less copper than a single-phase system. In other words, it's more economical!
