A resistance box used in a school laboratory has two 15 Ω resistors inside it, connected in parallel with each other between its two terminals. Two spare 5.0 Ω resistors are also available.
Which alteration would give a larger resistance between the terminals?
Removing one 15 Ω15\ \Omega15 Ω resistor and putting the two 5.0 Ω5.0\ \Omega5.0 Ω resistors, in series, in its branch
Replacing one 15 Ω15\ \Omega15 Ω resistor with the two 5.0 Ω5.0\ \Omega5.0 Ω resistors in parallel with each other
Removing one 15 Ω15\ \Omega15 Ω resistor and leaving its branch broken
Replacing one 15 Ω15\ \Omega15 Ω resistor with a single 5.0 Ω5.0\ \Omega5.0 Ω resistor
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.