Question

A fan with copper winding in its motor consumes less power compared to a similar fan with aluminium winding. Explain.

Answer 1

Answer:

P = V I  

P = 500 x 10^-3 x 220  

P = 110 watt

R= V² / 110  

R= 48400 /110  

R= 440 Ω

E= 220 x 500 x 10^-3 x 1  

E= 110 kWh  

E = 110 units

Explanation:

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Answer 2

A copper wire has higher conductance than an aluminium wire.

Explanation:

• A fan with copper winding consumes less power compared to a similar fan with aluminium winding because copper windings has higher conductance.
• So, copper wire offers less resistance to the current flow whereas aluminium windings conductivity is slightly less than copper which offers more resistance to the current flow.
• Copper not only has a higher conductivity than aluminium, but is more ductile, with relatively high tensile strength, and can be soldered easily.
• The resistivity of copper is 0.6 times than that of the aluminium.