An engineer is selecting resistors for a battery-powered indicator circuit. The circuit contains a 12.0 V d.c. supply and resistors A and B connected in series. Resistor A has a resistance of 6.0 Ω. During a test, the potential difference across resistor A is 3.6 V.
Calculate the potential difference across resistor B.
Calculate the resistance of resistor B.
The indicator circuit must have a current of no more than 0.50 A. Resistor B can be replaced by either an 8.0 Ω resistor or a 20.0 Ω resistor. Calculate the current for each replacement and state which replacement should be selected.
94 exam-style questions on AQA GCSE Physics 2.2 Series and parallel circuits, covering 2.2 Series and parallel circuits. Each one has a worked solution and a mark scheme showing where the marks go.