The sum of the electrical currents into a point in a circuit is equal to the sum of the currents out of the point.
A.
B.
C.
D.
Exam No：9702_s25_qp_14 Year：2025 Question No：34
Answer:
A
Knowledge points:
10.2.1 recall Kirchhoff’s first law and appreciate the link to conservation of charge
10.2.2 recall Kirchhoff’s second law and appreciate the link to conservation of energy
10.2.3 derive, using Kirchhoff’s laws, a formula for the combined resistance of two or more resistors in series
10.2.4 solve problems using the formula for the combined resistance of two or more resistors in series
10.2.5 derive, using Kirchhoff’s laws, a formula for the combined resistance of two or more resistors in parallel
10.2.6 solve problems using the formula for the combined resistance of two or more resistors in parallel
10.2.7 apply Kirchhoff’s laws to solve simple circuit problems
Solution:
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