• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Physics Lab Report. Aim: To find out how a light dependent resistor is affected by light intensity.

Extracts from this document...

Introduction

What is the relationship between light intensity and resistance in a Light Dependent Resistor?

Aim: To find out how a light dependent resistor is affected by light intensity.

Hypothesis: A light dependent resistor is one that changes its resistance with a change in the light intensity on it. Hence if we can find the light intensity that is on the resistor and its resistance, we can see what factor the resistance is affected by.

Variables:

Independent: Light Intensity

Dependent: Current

Controlled: Voltage, Resistor used, Ambient light, Filament Light Bulb used, light sensor and resistor.

Apparatus:

1. Filament Light Bulb

2. Clamp Stand

3. Light Dependent Resistor

4. Voltmeter

5. Wires

6. Light Sensor

7. Logger Pro

8. Laptop

9. Power Supply

Method:

1. Connect up all the wires in order to the resistor and the power supply.

...read more.

Middle

0.012

0.013

0.013

0.013

0.012

6318

7623

0.015

0.016

0.015

0.015

0.018

Data Processing:

First we calculate the average current and average light intesity

Average Light Intensity (Lux)

Average Current (± 0.001A)

1290.00

0.0060

1803.50

0.0072

2154.50

0.0078

3474.00

0.0102

4531.00

0.0126

6970.50

0.0158

Using V=IR we can calculate resistance since voltage was set at 1.2V at the beginning of the trials. We get the following values:

Average Light Intensity

Resistance (ohms)

1290

200.00

1803.5

166.67

2154.5

153.85

3474

117.65

4531

95.24

6970.5

75.95

...read more.

Conclusion

  1. The light sensor gave a band of values in which the intensity could be. It did not give one specific value.
  2. The resistance voltage was given only to one decimal place.

The assumptions in the experiment were:

  1. The light in the room did not change in intensity.
  2. The light sensor and the resistor were the same distance away from the filament bulb.
  3. There was no resistance in the wires.

The improvements that could have been made were:

  1. A better light sensor could have been used.
  2. We could have made sure that the light sensor was exactly the same distance away from the bulb as the resistance.
  3. The room could have been made darker
  4. The experiment could have been carried out further away from other students to prevent the light from their experiment interfering with mine.

...read more.

This student written piece of work is one of many that can be found in our International Baccalaureate 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

See related essaysSee related essays

Related International Baccalaureate Physics essays

  1. To test the ohmic and non-ohmic behavior in a resistor and a bulb

    Six different values were noted down. Result: mV (�3%) m A (�3%) 2.60 2.60 4.60 4.06 6.05 6.05 8.02 8.01 10.05 10.04 12.07 12.07 Calculation 2: R = V/I 1. R = 1 2. R = 1 3. R = 1 4.

  2. IB Specific Heat Capacity Lab

    Heat Lost � (mass of bob � temperature change of bob) [HS / MB � ?TB] = 1227.89 � ( 65.90 � 52.00) = 0.35832 J g-1 K-1 = 358.32 J kg-1 K-1 = [((0.01 � 65.90) � 100) + 0.96 %] + 22.270 % = 0.975 % + 22.270 % = 23.245 % = �83.29 CONCLUSION AND EVALUATION (CE)

  1. IB Physics Lab - Resistance

    Objective * The objective of this lab is to determine how the equivalent resistance of a collection of resistors in series or parallel depends on the individual resistors. Hypothesis * I believe that the theoretical equivalent resistance of a series circuit and a parallel circuit will always be slightly more than the experimental equivalent resistance.

  2. The Refraction of Light Lab

    refractive index number of water (our percent error was around half a percent - very small indeed). From this, several conjectures can be drawn such as how the textbook refractive values for different mediums were actually found - perhaps it was similar to our method but with more trials and better accuracy.

  1. Incandescent 100 watt light bulb ban: A bright Idea ?

    Light bulbs with filament and light bulbs without. In most cases the filament is made out tungsten. When heated it produces light. The filament is in an nitrogen/argon atmosphere which prevents the filament from simply burning up in the intense heat. Most of the energy consumed by the bulb is given off as heat, which is why it is inefficient in the long run (Weber).

  2. HL Physics Revision Notes

    Forces between molecules are weak. Molecules are essentially independent but will occasionally collide. While melting, vibrational kinetic energy increases and particles gain enough thermal energy to break from fixed positions. Potential energy of system increases ? While freezing, particles lose potential energy until thermal energy of the system is unable

  1. Light Intensity Investigation

    To determine the LUX illuminated at various distances, we will use Data Studio to give us accurate measurements of light hitting the light sensor that will be located at one of the ten distances, thus giving us our measurement for the particular trial.

  2. How does the sinkage depth of a tyre affect its rolling resistance ?

    The amount of the air inflated is between the range of the air pressure classified as underflated an overflated. The ideal air pressure which in this case is 147.12 kPa increases the thread area of the tire on the sand bed , increasing the width of the tore on the

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