If a copper wire is replaced by aluminium of the same dimensions in the same circuit, how do current and power consumption change? Explain using resistivity.
اسی سرکٹ میں تانبے کی تار کی جگہ یکساں ابعاد کی ایلومینیم تار لگانے سے رو اور طاقت کا مصرف کیسے بدلیں گے؟ مخصوص مزاحمت سے وضاحت کریں۔
Solution & explanation
Aluminium has higher resistivity, so R = ρL/A increases. In a wire-only load at fixed V, I = V/R and P = V²/R decrease. With other loads in series, the exact distribution changes; do not apply that power conclusion to every component without analysing the circuit.
Independent study answer. Original textbook ↗ · English-medium printed page 124–125.