Quick questions on Conduction of electricity: current and I = nAve - WJEC A-Level Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is current as flow of charge?

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By convention, current is the direction in which positive charge would flow, which is opposite to the actual motion of the electrons in a metal.

What is q1?

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A copper wire of cross-sectional area

1.0\times10^{-6}\,\text{m}^2

carries a current of

2.0\,\text{A}

. If

n = 8.5\times10^{28}\,\text{m}^{-3}

, find the drift velocity. Take

e = 1.6\times10^{-19}\,\text{C}

What is q2?

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Explain, in terms of

n

, why a metal conducts much better than a semiconductor. [2 marks]

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