Kirchhoff 39-s Laws Questions And Answers Pdf A Level [portable] Jun 2026

Using KCL: ( I_in = I_out ) ( 2 + 5 = I_3 ) ( I_3 = 7 , \textA )

Calculate the current ( I_3 ).

Conservation of electric charge. Charge cannot accumulate at a junction. kirchhoff 39-s laws questions and answers pdf a level

Actually: From (2): ( 2.5 I_1 = 10 - 4 I_3 \Rightarrow I_1 = 4 - 1.6 I_3 ) Sub into (4): ( 3.5 (4 - 1.6 I_3) - 7.5 I_3 = 5 ) ( 14 - 5.6 I_3 - 7.5 I_3 = 5 ) ( 14 - 13.1 I_3 = 5 \Rightarrow 13.1 I_3 = 9 \Rightarrow I_3 = 0.687 , \textA ) Then ( I_1 = 4 - 1.6(0.687) = 2.9 , \textA ) ( I_2 = 2.9 - 0.687 = 2.213 , \textA ) Using KCL: ( I_in = I_out ) (