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Core Concepts
Quick questions on DC electrical circuits: Ohm's law, Kirchhoff and potential dividers - WJEC A-Level Electronics
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 are kirchhoff's laws?Show answer
Kirchhoff's second law (voltage law): around any closed loop the sum of the EMFs equals the sum of the potential differences, because energy is conserved.
What is power?Show answer
Power is the rate of energy transfer, in watts. The three forms are interchangeable: pick the one that uses the quantities you already know. Power matters for choosing component ratings, since a resistor that dissipates more than its rating overheats.
What is q1?Show answer
A and a resistor are in parallel. Find the combined resistance. [2 marks]
What is q2?Show answer
A resistor carries with across it. Find its resistance and the power it dissipates. [3 marks]
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