D.C. Circuits
Definitions: D.C. Circuits
Exam question
Define the electromotive force (e.m.f.) of a source.
9702/23 · May/Jun 2021 · Q5(a)
Model answer
The energy transferred from other forms to electrical energy by the source per unit charge driven around the complete circuit.
Exam question
State Kirchhoff’s first law.
9702/21 · Oct/Nov 2025 · Q5(a)
Model answer
The sum of currents entering a junction equals the sum of currents leaving it.
Exam question
State Kirchhoff’s second law.
9702/22 · May/Jun 2024 · Q5(a)
Model answer
Around a closed loop, the sum of electromotive forces equals the sum of potential differences.