A student connects two components, X X\,X and YYY, in series.
The resistance of X X\,X decreases as the temperature rises. The resistance of Y Y\,Y increases as the temperature rises.
The total resistance of the series combination of X X\,X and Y Y\,Y remains constant when the temperature changes. The two components are connected across a power supply maintaining a constant potential difference.
Which statement is correct?
The current through component XXX increases as the temperature rises.
The potential difference across component YYY decreases as the temperature rises.
The total electrical power dissipated by both components remains constant as the temperature changes.
The ratio of the potential difference across XXX to the potential difference across YYY remains constant as the temperature changes.
136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.