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Electric circuits
Quick questions on Circuits and internal resistance: Kirchhoff's laws and EMF - Edexcel A-Level Physics
4short 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 required practical?Show answer
The standard Edexcel core practical connects a cell to a variable resistor (rheostat), with a voltmeter across the terminals and an ammeter in series. Vary the load, record matched and pairs, and plot against . The intercept gives and the magnitude of the gradient gives . Take readings quickly so the cell does not warm up and change , and use a high-resistance voltmeter so it draws negligible current.
What is q1?Show answer
State Kirchhoff's first law. [1 mark]
What is q2?Show answer
Two ohm resistors are connected in parallel. Find the combined resistance. [2 marks]
What is q3?Show answer
A cell of EMF V has internal resistance ohm. It delivers A. Calculate the terminal potential difference.
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