Two resistors of 120Ω and 180Ω are connected in series with a student-made resistor whose value is unknown. When a potential difference of 24V is applied across the entire combination, a current of 60mA is observed.
(i) Determine the equivalent resistance of the series combination.
(ii) Using the result of part (i), find the resistance of the student-made resistor.
(iii) Calculate the potential drop across each resistor in the circuit.
(iv) Verify that the algebraic sum of the individual potential drops equals the applied potential difference.