Ohm’s Law

Teaching and Learning Resources

Exercise 4: A Series / Parallel Circuit


  1. 1.Build the circuit as shown. The resistors should be of these values: R1 = 22 Ohms, R2 = 10 Ohms and R3 = 15 Ohms. The supply voltage is 6V.


  1. 2.Using Ohm’s Law, calculate what you would expect the current flowing through each resistor to be and the total current.


  1. 3.Calculate what voltage should be dropped across each resistor.


  1. 4.Measure all of the voltages and currents and check that they match what you would expect.


5. Challenge: Replace all of the resistors with three “unknown” values. Using your wit an guile, determine what values the resistors must be.