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AS 1 Forces, Energy and Electricity

Quick questions on Electric charge, current and resistance: Ohm's law and resistivity - CCEA 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 q1?
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A wire of length 2.0 m2.0\ \text{m} and cross-sectional area 0.50 mm20.50\ \text{mm}^2 has resistivity 5.0×10−7 Ω m5.0 \times 10^{-7}\ \Omega\,\text{m}. Find its resistance. [3 marks]
What is q2?
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Define potential difference. [1 mark]
What is q3?
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A charge of 90 C90\ \text{C} passes a point in 30 s30\ \text{s}. Find the current. [2 marks]

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