The correct answer is C. 100 %.
The resistivity of aluminium is 2.65 x 10-8 ohm-metres, while the resistivity of copper is 1.68 x 10-8 ohm-metres. This means that for the same electrical resistance, an aluminium conductor will need to be 1.65 times thicker than a copper conductor. However, aluminium is only about 60% the density of copper, so the aluminium conductor will only weigh about 100% as much as the copper conductor.
Option A is incorrect because the weight of an aluminium conductor is not 50% of the weight of a copper conductor of identical cross-section.
Option B is incorrect because the weight of an aluminium conductor is not 60% of the weight of a copper conductor of identical cross-section.
Option D is incorrect because the weight of an aluminium conductor is not
23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube