Recall that current depends on both the resistance of a component and the potential difference across it.
Understand that greater resistance results in a smaller current for a given potential difference.
Explain that for an ohmic conductor at constant temperature, current is directly proportional to potential difference, meaning resistance remains constant.
Describe how the resistance of components such as filament lamps, diodes, thermistors, and light-dependent resistors (LDRs) changes with the current.
Explain that the resistance of a filament lamp increases as the temperature of the filament increases.
Explain that the current through a diode flows in only one direction due to its very high resistance in the reverse direction.
Explain that the resistance of a thermistor decreases as temperature increases, and the resistance of an LDR decreases as light intensity increases.
Use graphs to determine whether circuit components are linear or non-linear, relating the curves to the function and properties of the component.
Design and use circuits to investigate the I-V characteristics of a variety of circuit elements, including filament lamps, diodes, and resistors at constant temperature.
