CAIE IGCSE Physics EXTENDED 4.3.3.2 Action of a variable potential divider
CAIE IGCSE Physics EXTENDED 4.3.3.2 Action of a variable potential divider
Practise tracing how variable potential dividers control output p.d., lamp brightness and sensor responses in real circuits.
How this is tested
- explain how an LDR or thermistor changes the share of supply p.d. in a divider
- predict lamp brightness or voltmeter reading as a slider moves along a resistor
- select X and Y components to make p.d. across Y rise for a given physical change