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# What is the voltage and amp service at the street before it steps down to the residence?

# Device used to step voltage up or down?

Transformer

# What size feeder service cable is required in step up transformer 220 to 380V in 300 amp cirquit breaker?

250 kcmil in copper and 400 kcmil in aluminum. kcmil = 1000 circular mils.

# Can you use a step down transformer as a step up transformer by reversing the primary voltage as a secondary?

Theoretically, yes; practically, no, as you won't have the power ratio to energize the primary with the same power as originally designed without a much larger than usual tran…sformer and much larger than usual secondary power.

# What allows simple transformers to step voltage up or down?

unequal coiling of wires

# Why current step down in voltage step up transformer?

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.

# What is a device that steps up or steps down the DC voltage?

As transformers do not work with DC., the answer is a voltage divider network (step down) or a voltage multiplier network (step up).

# 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.

# What is the max amps output if a transformer is 50kVA 480V going in step down to 120V and 240V?

416 A and 208 A respectively

# Which step in the rock cycle occurs immediately before sediments are laid down?

The step right before is when erosion breaks down rock.

# How do you step down voltage in transformers?

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.

Answered

# Can you change 100 amp service to 200 amp service?

Home owner big job Yes but none of the equipment from the 100 amp service can be reused, it will be a total rebuild. It is a complicated job in as much as you have to know wi…re sizes, ampacity of wires and proper electrical workmanship. Such a project should be left to a licensed electrical contractor to take out the proper permits and call for proper inspections. By taking this route it will leave you confident that if any mishaps happen to the installation down the road your insurance company will be behind you 100%. Some 200A upgrades can be accomplished simply by making the existing service panel a subpanel of a new 200A main panel and adding as many more 100A subpanels as you may need in your installation. It is not very difficult but requires a licensed electrician to deal with the power-grid side of the connections to the new 200A drop.

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# What is the combination of voltage and amps?

Specifically, Volts and Amps would be called VA or volt amps, as in the rating of a transformer, but it is loosely referred to as Watts. In DC theory, Volts mulitplied b…y Amps equals Watts. In AC theory, that same equation exists but it includes power factor. If the power factor given is 1 (100%), then Volts mulitplied by Amps multiplied by Power Factor of 1 equals your Watts.

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# How does voltage drop effect the amps?

amps drop as voltage drops , so the wattage goes down too.

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In Technology

# When a transformer steps down a power source what will remain the same the frequency the voltage or the current or none of these?

The frequency remains the same as one cycle in the primary corresponds to one cycle in the secondary. The stepdown voltage on the secondary as a ratio of the voltage on the …primary will be the same as the ratio of turns in the primary to turns in the secondary. The current in the secondary depends on two things: the current that the load is taking at the lower voltage of the secondary and the relative thickness of the wire in the secondary to the thickness of the wire in the primary. ANSWER: A transformer does not step up/down a power source ever it does however step up/down the voltage related to the primary. A typical transformer will always have an efficiency loss. The frequency on the output will remain the same as the input. It is not true that the big wires will give you more current that would be true only if the iron core is increased accordingly. otherwise saturation will occur

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# A step-up transformer has 200 turns on the primary coil and 3000 turns on the secondary coil The source to the primary coil has a voltage of 90 volts and a current of 30 amps?

If a step-up transformer has 200 turns on the primary coil and 3000 turns on the secondary coil, with a primary coil voltage of 90 volts and current of 30 amps, then the… turns ratio is 200:3000, so the secondary voltage is 1350 voltage and the available current is 2 amps. (This ignores losses through the transformer.)