An aluminum ribbon conductor is wide and thick

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

An aluminum ribbon conductor is

2.0\,\text{mm}

wide and

0.10\,\text{mm}

thick. When connected to a

12\,\text{V}

power supply it carries a steady current of

8.0\,\text{A}

. Approximately how long is the ribbon? (Resistivity of aluminum

= 2.8\times10^{-8}\,\Omega\!\cdot\!\text{m}

.) (a)

110\,\text{m}

(b)

4.9\,\text{m}

(c)

11\,\text{m}

(d)

1.1\,\text{m}

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