Because aluminium is, in simple terms, 'non-magnetic' and will not support the formation of magnetic flux. 'Soft' ferrousmetals with low reluctance* (i.e. metals such as iron or silicon steel) must be used.
[*'reluctance' is equivalent to 'resistance' in an electric circuit]
to reduce core reluctance..
Actually it depends on the air gap between the core and the windings of the transformer. This is the reason why stepped core is used in medium and large transformers as it decreases the air gap between the windings and the core of the transformer.
DC current cannot be used in a transformer only AC will work. A transformer needs the continual build and collapse of the magnetic field to keep the iron core from reaching saturation. Only alternating current will transfer power through a transformer.
No load current is energizing current. This is effectively "lost" power, power used in the transformer to energize the core. It, therefore, should be small!
A transformer is composed of two coils and wrapped around a core while a reactor is made up of one coil of wire. A transformer is used to increase or decrease the amount of current while a reactor is used to isolate circuits from a noisy background.
to reduce core reluctance..
An oil filled transformer is usually used outdoors and a dry core transformer is usually used indoors.
Actually it depends on the air gap between the core and the windings of the transformer. This is the reason why stepped core is used in medium and large transformers as it decreases the air gap between the windings and the core of the transformer.
The dc is supplied via a centre-tap on the transformer. This ensures zero dc net flux in the transformer core, which enables a much smaller core to be used.
Stranded aluminium, with a steel core.
Core transformer and shell transformer - it has a one window. - it has a two windows. - less mechanical protection - better mechanical protection to the coils. to the coils. -windings encircles the core. - core encircles the winding. - cylindrical windings are used. - sandwich type windings are used. - it is easy to repair. - it is not easy to repair.
The transformer needs AC at its input. The battery provides DC.
shell type core can be used
Yes, but not continuously and not for long. That transformer's core will saturate and get hot, possibly to the point of becoming a fire hazard.
The core is responsible for the hysteresis losses in a transformer. These are the losses associated with the ease, or otherwise, by which the core is able to become magnetised in one direction, demagnetise and, then, remagnetise in the opposite direction. These days, the type of material used (variations on silicon steel) are about as efficient as possible.
DC current cannot be used in a transformer only AC will work. A transformer needs the continual build and collapse of the magnetic field to keep the iron core from reaching saturation. Only alternating current will transfer power through a transformer.
No load current is energizing current. This is effectively "lost" power, power used in the transformer to energize the core. It, therefore, should be small!