Interested to Buy Any Domain ? << Click Here >> for more details...
Why is copper a better conductor of electricity than
aluminium?
- 5 Answers
- 10706 Views
- AES, I also Faced
- E-Mail Answers
Answer Posted / arul
The electrical capacity of any type of cables/wires are
depending on the heat withstand capacity of the material
wich can be calculated with the product of square of
current, Resistance of the material and Total time for flow
of current. I2RT. Resistance again can be calculated as
R=rho*L/A where rho is the resistivity, L is the length and
A is the area of cross section. So for a fixed current flow
and fixed Length of wire the area of cross section of the
cable is directly propotional to the resistivity.
resistivity of copper is 1.68x10 power -8 and that of Pure
Aluminum is 2.82x10 power -8. So.. for a specific current
flow, an aluminum cable size shall be 1.7 times that of
copper cable. This also is not recommented as the Aluminum
resistivity varries with the alloys and even with casting.
2.5 times the size of copper can be recommented for
Aluminum cables. Also as the temporature expansion of
Aluminum is 3 times that of copper. So all the termination
and joining areas shall be treated more sensible that of
copper.
| Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
Anybody know how schematic diagram for reverse power relay? RPR for generator protection
What is the difference between resistance grounding system and resistance earthing system?
anyone please send transformer parameter design formulas & details of tap changer ? plz i have interview this week its more helpful for me ?
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?
what is method for testing CT
What do you understand by external characteristics of a d.c. Generator?
what topics we have to concentrate for power grid et.written test.and tell what to read for english synonyms and antonyms.
calculate external resistance values to add to the rotor of a slip ring induction motor. STATOR- 415 V, 3 phase delta, 1100 A, 50 Hz, 1490 rpm, pf 0,86 ROTOR - 660 V, 590 A, 50 Hz. STATOR current at each steps STEP1-600A,STEP2- 800A,STEP3-1000A,STEP4-1100A.
Write down the brushes of a de machine.
On a 6 KVA UPS we have to provide a DC MCB for Battery bank of 16 nos (12 V 42 AH). What Shall be the current rating of DC MCB ?
if flux and load static in dc motor and supply voltage increases 20% then what happened in speed
how balanced in star delta connection ?
How we can calculate the consumption in kwh of motor on basis of kw @100% load, @50% load & @ no load.
What is the lower limit of break-down voltage of converter transformer.
What are reasond for high wattage in single phase induction motors
