The 240 volts coming in is coming from two separate 120 volt lines (phases). In your home, it's called single phase, although it really should be called two phase or double phase. In the box, there are two "hot" wires coming in, and one "neutral" wire. You add a ground wire to that yourself (check local codes).
Basically (this is very simple description), one of the hot wires gives 120 volts, and the other gives 120 volts, but just a little bit behind the first phase. If you pull the cover off your electric panel, you would see two "hot" wires connected to two separate 'bus bars'. Every other slot on the left side of the breaker box is connected to hot 1, and the alternate slots are connected to hot 2. When you need 240 volts, the breaker you install will take up two slots, adding the 120 (hot 1) plus 120 (hot 2) to give you 240. For your regular plugs, a single slot breaker will deliver 120 volts.
If you have a 240 volt plug, it will normally have 4 prongs. Two of the prongs have 120volts each (relative to ground) and 240 volts relative to each other (due to the lagging/leading phase difference.)
A transformer
A transformer is an electrical device that takes electricity of one voltage and changes it into another voltage.
A DC-to-DC converter is the general term for a device that changes DC voltage at one level to another.
A transformer. it steps up / down voltage, and steps down / up current.
Whenever you are working over a device and getting a constant voltage supply ,, and all of a sudden .. the light gets off and the device is off. it means a device was working over some specified voltage and it comes to 0 instantly . the voltage changes . this is called voltage fluctuation .
the voltage at which electronic device operates is callled threshold voltageand the voltage at which device show cinduction in forward biased stste
A transformer is an electrical device that takes electricity of one voltage and changes it into another voltage.
The electrical device is a transformer.
The electrical device is a transformer.
A transformer is an electrical device that takes electricity of one voltage and changes it into another voltage. You'll see transformers at the top of utility poles and even changing the voltage in a toy train set.A transformer changes electricity from high to low voltage using two properties of electricity.
A Transformer.
A rectifier is an electronic device that changes an AC voltage to a DC voltage.
Transformer for one.
A resister
heater
A voltage regulator is a circuit or device designed to deliver a constant voltage at its output regardless of changes in load current.A voltage stabilizer is a circuit or device designed to deliver a constant voltage at its output regardless of changes in incoming voltage.
The electric static generator is a device that produces static electricity, or electricity at high voltage
A DC-to-DC converter is the general term for a device that changes DC voltage at one level to another.