Electricity and Magnetism
# Resistors

If a current of \(4.00\text{ A}\) flows in a copper wire with a cross-sectional area of \(2.70 \times 10^{-6}\text{ m}^2\) and a length of \(5.40\text{ m},\) approximately how much electrical energy is transferred to thermal energy in \(15\text{ min}?\)

The resistivity of copper is \(1.69 \times 10^{-8}\,\Omega\cdot\text{m}.\)

A Nichrome wire that has a cross sectional area of \(2.50 \times 10^{-6}\text{ m}^2\) is connected to a potential difference of \(75.0\text{ V}.\) If the wire dissipates \(4000\text{ W},\) what is its approximate length?

Nichrome has a resistivity of \(6.00 \times 10^{-7}\,\Omega\cdot\text{m}.\)

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