Light Dependent Resistor
Controlled Assessment ISA (PU 2.5)
Light Dependent Resistors (Section 1)
1. Write down your hypothesis. Explain why you made this hypothesis.
Hypothesis:
When it is day there is more light hitting the LDR and so its resistance decreases and the light turns off. When it is night there is less light so the LDR has higher resistance and the light turns on.
Explanation:
When light shines on a Light Dependent Resistor, electrons are released and the current can get larger. So as the light intensity increases, more electrons are released and the resistance decreases. As the light intensity decreases, less electrons are released and the resistance increases.
2. Think about the research you did to find how to test your hypothesis.
Identify two sources you used …show more content…
The Light Dependent Resistor will be put into the clamp (keeping the orientation aligned with the bulb), and a space will be measured of 5cm between the end of the bulb and the beginning of the LDR. The clamp will be moved to the 5cm mark.
The Multimeter will be turned on and set to measure resistance (Ohms), and 2 wires will be placed in the appropriate holes in the Multimeter.
Next, Crocodile Clips will be attached to both the LDR and the wires used in the previous step.
The Multimeter will be checked for a Zero Error (Where the reading should be zero, but the Multimeter says otherwise), and if one has occurred, restart the Multimeter. If one has not occurred, or restarting has fixed the error, turn on the lamp and record the reading.
The range of testing is 5cm to 50cm. Measure another 5cm and move the clamp back in 5cm intervals, keeping the LDR in the same orientation. An interval is the amount of distance between readings. Repeat this step until you get to 50cm.
Lastly, repeat steps 3 to 9 again, to remove any anomalous results and to achieve more precise results, as well as a better
Light Dependent Resistors (Section 1)
1. Write down your hypothesis. Explain why you made this hypothesis.
Hypothesis:
When it is day there is more light hitting the LDR and so its resistance decreases and the light turns off. When it is night there is less light so the LDR has higher resistance and the light turns on.
Explanation:
When light shines on a Light Dependent Resistor, electrons are released and the current can get larger. So as the light intensity increases, more electrons are released and the resistance decreases. As the light intensity decreases, less electrons are released and the resistance increases.
2. Think about the research you did to find how to test your hypothesis.
Identify two sources you used …show more content…
The Light Dependent Resistor will be put into the clamp (keeping the orientation aligned with the bulb), and a space will be measured of 5cm between the end of the bulb and the beginning of the LDR. The clamp will be moved to the 5cm mark.
The Multimeter will be turned on and set to measure resistance (Ohms), and 2 wires will be placed in the appropriate holes in the Multimeter.
Next, Crocodile Clips will be attached to both the LDR and the wires used in the previous step.
The Multimeter will be checked for a Zero Error (Where the reading should be zero, but the Multimeter says otherwise), and if one has occurred, restart the Multimeter. If one has not occurred, or restarting has fixed the error, turn on the lamp and record the reading.
The range of testing is 5cm to 50cm. Measure another 5cm and move the clamp back in 5cm intervals, keeping the LDR in the same orientation. An interval is the amount of distance between readings. Repeat this step until you get to 50cm.
Lastly, repeat steps 3 to 9 again, to remove any anomalous results and to achieve more precise results, as well as a better