Photo AI
The diagram shows a circuit containing a light-dependent resistor (LDR) attached across an ohmmeter - Junior Cycle Science - Question b - 2017
Question b
The diagram shows a circuit containing a light-dependent resistor (LDR) attached across an ohmmeter. Light from a lamp shines directly on the LDR. (i) How could the... show full transcript
Worked Solution & Example Answer:The diagram shows a circuit containing a light-dependent resistor (LDR) attached across an ohmmeter - Junior Cycle Science - Question b - 2017
Step 1
How could the intensity of the light shining on the LDR be changed?
Answer
The intensity of the light shining on the LDR can be changed by adjusting its distance from the lamp. Specifically, you could:
- Move the lamp closer to increase light intensity.
- Move the lamp further away to decrease light intensity.
- Alternatively, you can reduce the brightness of the lamp or change the bulb to one with a different wattage for an overall change in light output.
Step 2
Using the axes on the right, sketch a graph to show how the resistance of the LDR is affected by light intensity.
Answer
The graph should illustrate an inverse relationship where the resistance of the LDR decreases as the light intensity increases. It begins with high resistance at low intensity and declines sharply as intensity rises.
egin{center} Graph:
Resistance
|
|
|
|
|
|
|
|
|____________________________________________________ Light Intensity
ext{
As light intensity increases, resistance decreases. } egin{center}
Step 3