#60
4.5.6.4 Relationship
Paper 2 · Higher combined
Spec reference: 4.5.6 (subtopic).
What you need to know
- Relationships in Circuits (Using a
- filament bulb, ohmic conductor, diode.)
- Independent variable: potential difference/volts (V).
- Dependent variable: current (A).
- Control variable: number of components (e.g. 1 filament
- bulb, 1 resistor), type of power source.
- Set up the circuits as shown below and measure the
- current and the potential difference.
Self-assessment (checklist)
- I can describe what a distance-time graph can be used
- I can state what can be calculated from the gradient of
- I can draw distance-time graphs from measurements.
- I can interpret lines and slopes of distance-time graphs
- I can determine speed from a distance-time graph.
Key steps (method)
- Identify what the question is testing and use the correct equation/definition.
- Show substitutions and units clearly.
Common mistakes
- Unit conversions, rearranging errors, or quoting a law without applying it.