Advantages of High Voltage DC Current (1 Viewer)

[gurusson]

What are the advantages of High Voltage DC current to modern applications of electricity.

 

[m.jakaran]

High voltage current in general is beneficial as it allows for a lower loss while transporting electricity, or a need for expensive wires with a large cross-sectional area.

 

[Ryuu-jin-jakka]

anyone no, how motor could be converted from AC to DC or vice versa???

 

[lychnobity]

anyone no, how motor could be converted from AC to DC or vice versa???

Be specific. Do you mean from an AC motor to a DC motor?

 

[gurusson]

anyone no, how motor could be converted from AC to DC or vice versa???

This should be in a different thread.

 

[Ryuu-jin-jakka]

which tread is it, can't find it ><'

 

[gurusson]

what i should have said was, you would be better off starting a new thread. you do this by click on the "new thread"button in the top right hand corner.

 

[youngminii]

High voltage current in general is beneficial as it allows for a lower loss while transporting electricity, or a need for expensive wires with a large cross-sectional area.

DC current cannot be transformed (as far as we need to know) and hence the whole transmission loss thing cannot be used as an advantage.

anyone no, how motor could be converted from AC to DC or vice versa???

This is beyond the Syllabus, meaning we don't need to know this. However there are motors with both slip rings and a split ring commutator with a little switch to set which one to use. These are only used for demonstrative purposes and are practically useless.

You might be talking about the Universal Motors, which can utilise both AC and DC currents. These are also beyond the Syllabus.

 

[helper]

What are the advantages of High Voltage DC current to modern applications of electricity.

You mean in transmission?
DC transmission in superconductors has the advantage of no power loss due to resistance (old disadvantage of DC) and it doesn't suffer loses due to induced currents in surrounding metals (disadvantage of AC).

They also do not emit electromagnetic radiation

 

[youngminii]

DC is also much less lethal.

 

[helper]

DC current cannot be transformed (as far as we need to know) and hence the whole transmission loss thing cannot be used as an advantage.

There have been a number of past questions that require you to know induced currents can be produce by switching on and off DC.

 

[Ryuu-jin-jakka]

DC current cannot be transformed (as far as we need to know) and hence the whole transmission loss thing cannot be used as an advantage.

This is beyond the Syllabus

Then why is the teacher want this question to be answer for this assessment then ><'

 

[chid92]

why not?

 

[esstown]

There have been a number of past questions that require you to know induced currents can be produce by switching on and off DC.

DC isnt transformed to AC here? Its just a changing magnetic flux in the coil as a result of the intermittent current (switch) which results in induced currents in surrounding conductors. You could say its similar to AC in the sense magnetic flux is changing.

 

[youngminii]

Then why is the teacher want this question to be answer for this assessment then ><'

Transmission refers to the delivery of electricity via the cables in the street.

DC cannot be turned into AC.
AC can be turned into DC via means of a rectifier, which is used in small electrical devices in the home that require small DC voltages (since AC is supplied)
Pretty sure that it's not in the Syllabus.

 

[helper]

DC isnt transformed to AC here? Its just a changing magnetic flux in the coil as a result of the intermittent current (switch) which results in induced currents in surrounding conductors. You could say its similar to AC in the sense magnetic flux is changing.

No it isn't transformed to AC, as the current supplied only travels in one direction.
It will have alternative direction currents produced when it is switched on and off.

Its commonly called a chopped DC. It uses a DC supply but yes it is similar to AC because the flux is changing and thuis can be transformed.
Q8 in 2005 and Q 10 in 2006 are examples of this.

 

[gurusson]

Thank you for your help.