Physics (AS & A Level) · Feb / March 2016 · Paper 12 · Question 36

In deriving a formula for the combined resistance of three different resistors in series, Kirchhoff's laws are used. Which physics principle is involved in this derivation?

1. Athe conservation of charge
2. Bthe direction of the flow of charge is from negative to positive
3. Cthe potential difference across each resistor is the same
4. Dthe current varies in each resistor, in proportion to the resistor value

As printed in the paper