What would you like to do?
What is the voltage and amp service at the street before it steps down to the residence?
The voltage and ampacity can vary depending on the demand of the neighborhood. The voltage is typicaly 240 volt with the amperage capacity varying. Answer 7,200 volts goes to the transformer on the pole, amperage varies.
Was this answer useful?
Thanks for the feedback!
The metaphor of stepping down is that you are going to a lower level of voltage. So no, a step down transformer does not increase voltage, it decreases it.
unequal coiling of wires
In an ideal transformer, Power In = Power Out Example: The input voltage of 115vac @10amps is stepped up to 230vac, so what is the secondary current? 115 x 10 = 230 x I … I = 115 x 10/230 I = .5 x 10 = 5 amps The current is stepped down to 5 amps from 10 amps
Can you use a step down transformer as a step up transformer by reversing the secondary voltage as a primary voltage?
Yes a Tesla coil or ignition coil is an example.
Can you use a step down transformer as step up transformer by reversing the primary voltage as a secondary voltage?
If the transformer has two separate windings, then, YES a step-down can be used as a step-up, and vice-versa. It is more correct to say you are reversing the high and l…ow sides. By definition Primary is the "IN" side and Secondary is the "OUT" side. The Primary could be the high voltage side if it is a step-down, or it could be the low voltage side, if it is a step-up. Design Considerations Care must be taken when reversing the operation of a step-down transformer to insure that it does not exceed the ratings of the transformer. For example, let's say we have a 12 VA step-down transformer that takes 120Vac in and is rated to provide 12V at 1 amp at the secondary. If we were to reverse it and apply 12Vac to the new primary (the old secondary), we would have 120Vac at the new secondary, but to keep within the original ratings it could only be loaded to 0.1A @ 120Vac. As long as you treat the output rating of the step-down transformer as the input rating as a step-up transformer, and don't try to draw current beyond what would normally have been applied to the high voltage primary, you should be fine. Potentially one could push up the voltage on such a transformer beyond what its stated application specified, while making sure not to exceed the power rating of the transformer and not exceeding the breakdown voltage of the transformer's insulation, for example driving the above transformer at 24V to get 0.05A @ 240Vac. It is important to realize though that the rated input voltage for a step-down transformer will likely not be a safe input voltage if you use it as a step-up transformer - for example, applying 120V to the above transformer with the windings reversed would generate 1.2KV! One important point to remember when reversing a three-phase transformer to a step-up is what kind of windings it has. Most three-phase transformers use a "delta" configuration on the primary side. This means that there are three "hot wires" and a ground, but not a neutral. (The white wire in a circuit). On the secondary side, transformers are usually wired up in a "Wye" (sometimes called a "star" configuration. Doing this allows the transformer to create a Neutral connection. If a step-down transformer is reversed to make it a step-up, the high (output) side will not have a Neutral connection. If one is not needed, say for a three-phase welding machine, this would not be a probem. However, if a Neutral IS needed ,say for lighting, reversing this transformer would not work. In this case, a listed step-up transformer will be needed. One final thing, if a step-down transformer is used as a step-up, a Neutral wire is not required to be connected to the input side.
Voltage is stepped up during transmission to reduce the power loss during transmission due to resistance. Power is a product of Voltage*Current, and losses due to resistance a…re directly proportional to the square of the current. Now when we increase the voltage , keeping the power constant, the subsequent current reduces.. thus in turn reducing the transmission losses.
As transformers do not work with DC., the answer is a voltage divider network (step down) or a voltage multiplier network (step up).
You need alternating current for a transformer, for DC you would have to interrupt the power supply to make it effectively DC pulses.
You can make a voltage divider set of resistors and tap off the desired voltage. Some voltage regulators can be fed much higher voltages. The regulator will provide a co…nstant settable voltage with short circuit and overload protection. There are DC to DC converters. They first turn the DC into AC then rectify it and produce DC.
What is the equation for calculating the dc output voltage for a given ac input voltage to a step-down transformer?
There is no such equation, since the output of a step-down transformer is not DC. The AC output is simply the input voltage divided by the turns ratio. So, if the input voltag…e is 120V, and the turns ratio is 5:1, then the output would be 24VAC. Now, if the transforner is followed by a rectifier, producing a DC output, then the output voltage depends on the type. For a half-wave rectifier, the DC output is 0.707 time the AC output. For a full-wave rectifier, the DC output will be 1.414 times the AC output. So, if we take our 24VAC transformer output, and feed it through a full-wave rectifier, the DC output would be 33.9VDC. If the rectifier output is smoothed by a filter capacitor, then the above is only true if the power supply is loaded. The half-wave rectifier output will drift up to the peak voltage (1.414 * AC) if it has no load.
step up or stepdown is done by the ratio of the number of turns in the primary / secondary coil, large number on high voltage side small number on low voltage side. the wire u…sed on the low voltage side would be thicker than the high.
Voltage times amps equals watts. A watt is sometimes called a volt-amp because one volt times one amp equals one watt.
The English Prime minister resides at No10 Downing Street (currently Gordon Brown Feb 2008) and his name is Gordon brown. One small problem with the above Gordon Brown is the …British Prime Minister & He's SCOTTISH ! Please refer to 'England ' as either GB or UK. England is part of the British Isles and part of the United Kingdom & although I am English, living in England, my Scots, Welsh & Irish compatriots do not enjoy being ignored............... The UK PM ... United Kingdom's or alternately Britain's Prime Minister lives there. It's referred to quite commonly there and in the US as "Number Ten Downing Street" ... the US equivalent would be "1600 Pennsylvania Avenue", for The White House.
A: By using PWM or magnetic amplifiers