A portable inspection device contains two resistors in series across a 12 V supply. One resistor has a resistance of 8.0 Ω, and the current is 0.60 A. The 8.0 Ω resistor is then replaced by a 12 Ω resistor. After the replacement, the current must be no more than 0.45 A.
Calculate the current after the 8.0 Ω resistor is replaced, and determine whether the device meets its current limit.
81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.