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Electricity and Magnetism
Quick questions on DC circuits and Kirchhoff's laws explained: H2 Physics Electricity and Magnetism
6short 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 kirchhoff's current law (charge conservation)?Show answer
The sum of currents entering a junction equals the sum leaving it:
What are combining resistors?Show answer
A parallel combination always has a smaller resistance than the smallest individual resistor.
What are sign errors in Kirchhoff loops?Show answer
Choose a consistent direction around the loop and be careful with the signs of e.m.f.s and p.d.s.
What is q1?Show answer
State Kirchhoff's two laws and the conservation principle each expresses. [2 marks]
What is q2?Show answer
Three resistors of , and are all in parallel. Find the combined resistance. [2 marks]
What is q3?Show answer
A cell of e.m.f. and internal resistance supplies . Find the terminal potential difference.
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