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How does auto transformer work with DC supply?
Transformers don't work with DC supplies - they only work on AC.
Do step up and down transformer only work with ac power or can you use them in dc only?
AC only. That's one of many reasons why AC is more useful (and more widely used!) than DC.
Can a rectifier work on DC?
Well, yes. But it isn't much needed as DC is already DC.
Will a photocell work using dc voltage?
it creates a dc current
Does electrical transformer use a DC or AC source?
A transformer is a device to convert high voltage AC to low voltage AC & vice-versa. It works on the principle of induction. Since induction occurs only in an AC supply, a transformer cannot work on DC.. So, it is not possible to convert DC supply to AC using transformer. You would need an inverter to convert DC to AC.
Do you have to connect a cell to work an electromagnet?
A cell or other (DC) power source must, indeed, be connected to an electromagnet to make it work. It is an electromagnet. Surf the link to our friends at Wikipedia. It's a good article, and the pics are cool.
Can a electromagnet act as a magnet when the source is dc?
yes it can
How does auto transformer work with DC supply?
Transformers don't work with DC supplies - they only work on AC.
Why dc source is used for dc supply?
it is only work on it so that used
How do motors that do NOT use magnets work?
Motors that do not have magnets work exactly the same. The permanent magnet is replaced by a electromagnet, which is a coil of wire with a voltage applied to it. This electromagnet is what produces the magnet field necessary for a motor to operate. It is just easier and lighter to use this style of DC motor in larger applications.
The rotating electromagnet coil assembly in a dc motor is called what?
it is called an armature
Is an electromagnet always magnetic?
No. Only when an electric charge is put through the electromagnet.
How do electromagnet fire alarms work?
the electromagnet makes the door close when a fire alarm goes off
What are the devices that make used of electromagnet?
AC/DC Motors, Generators etc. are the devices that make Used of electromagnets.
Why semiconductors work on DC only?
the NP or PN junction only allows current to flow in one direction (think diode), therefor DC would be the only energy capable
Can a DCC equipped model train work on a DC track?
It can only work if you add a converter inside.
How is electromagnet the same as permanent?
An electromagnet is only magnetic while current is flowing through the coils. A permanent magnet is always magnetic, and does not need electricity. An example of an electromagnet at work is in a metal scrape yard, where a large electromagnet is used by a crane operator to lift ferrous metals into a crusher (scrapped cars, for instance). The metal drops into the crusher when the electricity is switched off by the crane operator. Therefore, they are only really similar when both are magnetised.
