• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4

# Investigating LDRs

Extracts from this document...

Introduction

Investigating LDRs A light dependent resistor is a resister that depends on the amount of light shining on it. Introduction I will be investigating how much of a current that flows through the resistor depends on the amount of light that is shining on the LDR. Planning My prediction for this coursework is that the more the further that I move the LDR from the light the weaker the current will be on the milliammeter. Equipment The equipment that I will be using will be: Milliammter LDR Cell (battery) Meter Ruler Lamp Power Pack 4 Leads Component Clip Method Step by Step I will be working in a pair. I will set up a circuit that will measure the amount of light that will shin on the LDR.I will be taking 8 reading of different distances. ...read more.

Middle

The only thing that will change is the distance from the LDR to the light. Here is a table that shows the distances I will be using: Distance (cm) 1 5cm 2 10cm 3 15cm 4 20cm 5 25cm 6 30cm 7 35cm 8 40cm Here is a diagram that show how a LDR works: Here is a picture of the circuit I will be using: Here is a table of my results: Distance (cm) Current test 1 (MA) Current test 2 (MA) Current Test 3 (MA) 1 5cm 9.3 9.3 9.3 2 10cm 5.3 5.3 5.3 3 15cm 3.4 3.4 3.4 4 20cm 2.4 2.4 2.4 5 25cm 2 2 2 6 30cm 1.4 1.4 1.4 7 35cm 1.2 1.2 1.2 8 40cm 1.1 1.1 1.1 This table show that I have made my distance correct and I have read the readings on the milliammeter accurately. ...read more.

Conclusion

I think that the test went good because my result come out correct that is because I made it a fair test. I took 24 reading all together and put it into a line graph. I found out that my predication was correct and that the further away the LDR is from the light the less current there is. My original finding and conclusion were correct see last section for details. My results are accurate because I carried out a fair test, which then allowed my recording to be accurate. I had one anomalous result, which did not fit into the pattern maybe it was because there was a little big of light in the back ground so the reading did not come out correct. If I would improve my investigation I would have done more readings to make it an even fairer test and I could have compared my result with other peoples results. ?? ?? ?? ?? Tamar Amin Page Physics coursework ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Electrical & Thermal Physics essays

1. ## Thermistor Coursework

and the resistance at 30 °C is 800? Value of Fixed Output Voltage at Output Voltage at Difference Between Output Resistance in ? 20°C (5v input) 30°C (5v input) Voltages at 30°C and 20°C 500 3.559 3.054 0.505 600 3.367 2.854 0.513 700 3.151 2.833 0.318 800 3.000 2.500 0.5

2. ## Sensors cwk. The aim of this coursework is to construct a potential divider circuit ...

> Mark out 10cm points, starting from 10cm to 200cm. > Make sure the variable resistor is fixed at a resistance of 1k?. > Place the bulb 10cm from the LDR (at your first point or mark). > Record the Voutput shown on your voltmeter and tabulate this.

1. ## physics sensor coursework

Therefore, I will take a range of eleven values between 0 lux and 1000 lux. Including 0 lux and in increasing intervals of one hundred lux, I will record the voltage output up to and including 1000 lux. For each light intensity, I will take three readings.

2. ## Using an LDR to detect the intensity of plane polarised light allowed through a ...

Ambient Light As I was describing why I did not use an infra-red transmitter, I mentioned ambient light, which will cause a lot of problems when I am going my coursework: As you can see, the intensity of the ambient light will be much greater than the intensity of the light which has just passed through two Polaroids.

1. ## Choosing a light source

(which represents the wavelength of the light in meters) and again this is sometimes given or otherwise calculate it. This is the formula used in general M ?=d. sin ? (1) To calculate for ? (wavelength) (4) To calculate for sin ? (angle) You do ?= d. sin ?

2. ## Physics coursework

or a PTC thermistor but if the resistance decreases as the temperature increases then I will know I am using a NTC thermistor, if the temperature and resistance are opposite to that of a NTC then I will be using a PTC.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to
improve your own work