This website uses cookies to ensure you have the best experience.

# Light Intensity Essay

3132 words - 13 pages

Light Intensity

Hypothesis

§ A light bulb gives out light when electricity passes through it

§ The more volts you add, the more intense the light is. As you double
the voltage, the light intensity doubles.

§ This is because the rays are more concentrated. The rays are twice
as concentrated as the intensity doubles, as more power is running
through the circuit

§ The LDR (Light dependent resistor) measures how intense the light is

§ The LDR frees up electrons, decreasing resistance

§ The more intense the light is, the lower the resistance in the LDR

§ Ohms law says that current increase is proportional to potential
difference

§ This only occurs if all conditions are the same

§ As Potential difference doubles, Current doubles.

§ Resistance is voltage over current.

§ If voltage rises proportionally with current, then resistance will
halve as voltage doubles.

§ So as I halve the voltage, the current halves, light intensity
halves, and resistance doubles.

Method

This is how I will set up the apparatus. Below is a circuit diagram.

The set up of the circuit is simple as shown above. The 12-volt lamp
is set up in a simple circuit. Then in a SEPARATE circuit, the light
dependent resistor is connected to the Multimeter, which shows the
resistance readings. If I did connect the LDR in the same circuit, I
would almost certainly fry the LDR, and ruin the experiment! I want to
keep the distance from the lamp to the LDR the same. I have decided
after testing the system, to put the LDR directly under the lamp. This
is dim. It also helps to cancel out any other light, which will
obviously get in the way more, the further the LDR is from the bulb. I
will find out how much this effects the results in the preliminary
practical.

I will needed to keep the bulb at a set height, perhaps 2cm above the
LDR. During the preliminary practical, there are many things I can do
to get the optimum results. That includes keeping the distance and
height the same, but also taking the correct resistance reading. You
can set the resistance readings on the Multimeter to different levels
of accuracy. If you don't have a large enough setting, the dial will
display one. I will then go down one until I get a suitable answer. I
may even have to change the accuracy settings during the preliminary
practical, if they become too inaccurate. My independent variable is
voltage (potential difference). I will be finding out how the
intensity of the light effects resistance of the LDR. I will be going
up in gaps of 2 volts, up to 12 or 14 volts, giving me seven readings.
I need to make sure I get two, preferably 3 sets of good results, to
iron out anomalies, getting a better overall average.

Some small...

## Find Another Essay On Light Intensity

### The effect of light intensity on the rate of photosynthesis

1641 words - 7 pages How light intensity effects theRate of photo synthesis.AimThe aim of my experiment is to find out how light intensity affects the rate of photosynthesis.PredictionI predict that as the light intensity increases that the rate of photosynthesis will increase in proportion, so for example if you increase the light intensity from 10cm away to 20 cm away form a stationary plant. There for the rate of photosynthesis will decrease proportionally with

### The Effect of Light Intensity on the Rate of Photosynthesis

836 words - 3 pages The Effect of Light Intensity on the Rate of Photosynthesis Plan: Aim: To investigate the affect of light intensity on the rate of photosynthesis. Theory: Before I predict what will happen I must look at how photosynthesis occurs. Photosynthesis is the way plants create a source of food for themselves. Photosynthesis requires the following resources; Carbon Dioxide, Water and light. Inside the leaves of a

### How does light intensity affect the rate of photosynthesis?

2729 words - 11 pages How does light intensity affect the rate of photosynthesis?Poorly PondweedQuestions1) How does light intensity affect the rate of photosynthesis?2) How does temperature affect the rate of photosynthesis?sunlightcarbon dioxide + water glucose + oxygenchlorophyllsunlight6CO2 + 6H2O àààààà C6H12O6 + 602chlorophyllPredictionI predict that the more intense the light, the higher the rate of photosynthesis. To

### Effect of light intensity on rate of photosynthesis on elodea plant

4433 words - 18 pages LIGHT INTENSITY AND PHOTOSYNTHESIS LAB REPORTGROUP MEMBERS: Maritoni Valencia, Sangita Tamang, Ryutaro Seiki and MaoIntroduction:Light intensity is one of the factors affecting the rate of photosynthesis. Other factors are concentration of carbon dioxide, temperature and to a lesser degree, water. Light intensity directly affects the light-dependent reaction in photosynthesis and indirectly affects the light-independent reaction.Light is a

### How light intensity affects the rate of photosynthesis. (Measured by the amount of bubbles produced in 2 minuets)

2931 words - 12 pages Planning 6/6Analasis 6/8Implementation 6/8Evaluation 4/6NOTE:PICTURES AND DIAGRAMS FROM THE ORIGONAL ESSAY WILL NOT APPEAR SO THERE MAY BE UNXPLAINED GAPSHow light intensity affects the rate of photosynthesis.(Measured by the amount of bubbles produced in 2 minuets)Scientific Knowledge and UnderstandingCanadian pondweedThis is the pond weed we will be using. It is North American and widely naturalized in EuropePhotosynthesisPhotosynthesis - The

### Photosynthesis

1004 words - 4 pages PHOTOSYNTHESISINTRODUCTION:In this coursework I'm going to investigate the factors that affect the rate of photosynthesis, but first am going to explain:1. What photosynthesis is?2.What the rate of photosynthesis is?3.And list the factors that affect photosynthesis.The aim of my experiment was to see whether intensity of light would affect the rate of photosynthesis in a plant. To do this, I placed a piece of Canadian pondweed in varying light

### Blood Pressure

899 words - 4 pages similar effect on decreasing systolic/diastolic blood pressure. Intensity Intensity is an important factor for monitoring the effect of walking on blood pressure. In this context, a study by Fagard (2001) considered the effect of heart rate, work load and exercise capacity on blood pressure. The intensity of the walking was classified into light (20%-30), moderate (50-60%) and high intensity when the intensity more than 65% in order to measure

### Reflection and refraction

627 words - 3 pages to identify the light were as amplitude identifies the intensity of the light. Frequency is directly proportional to energy and is the number of completed cycles per second-1 (hertz) of a wave. See figure 2 for examples of areas of Light, waves and frequency. Reflection is the angle of which a ray or wave rebounds perpendicular off a surface at the point of reflection. The law of reflection states ‘when a ray of light reflects off a surface, the

### Photosynthesis lab report

1787 words - 7 pages AbstractPhotosynthesis is a food making process for algae and plants. The photosynthesis process rate varies from different wavelengths and intensities of light. This lab will evaluate the optimal wavelengths and degrees of intensity during photosynthesis when chloroplast is exposed to light. The mixtures of DCPIP with water, PO4 buffer, and chloroplast will be prepared in a number of cuvettes. The cuvettes were tested individually at different

### Slater Investigation on Responce to Light Stimuli

2296 words - 9 pages of bushes or trees. So that they were not exposed to a lot of light and there is protection from predators such as blowflies and centipedes, sufficient food and damp. The ground was mostly made up of damp organic matter, damp soil, moist leaves, some were found on stony ground.The light intensity is significant to the niche and way of life of the Slater because they are classed as scavengers; they live off decomposing matter and if the matter

### Photosynthesis

1124 words - 4 pages . After it reaches a certain point though the enzymes involved in the reaction become denatured and stop working properly. The final factor, which contributes, is light. We decided to investigate how this affects the rate of reaction also. Method ====== We need to find out how the of presence light and the intensity contributes to the rate of photosynthesis. To be able to measure the rate we need a

## Similar Essays

### Light Intensity Essay

942 words - 4 pages By looking at Table A in the microscopic light results, it can be seen that the results would obey the inverse square law. This was because as the distance increases the light intensity of the microscopic light decreases. The graphs that demonstrate the inverse square law can be seen in figure 1 and 3. Thus, it is evident that the relationship between light intensity varies inversely with the square of the distance holds truth in real-life

### How Light Intensity Effects Vitamin C?

940 words - 4 pages a glass of orange juice from the jug when I realized that it tasted a little sour. I started to think that the drink mite have lost some thing as it was out in the light.I later found out that it was the Vitamin C that had broken down while it was out in the sun.HypothesisVitamin C and be easily broken down by UV-light and form free radicals. These free radicals can damage the body internally by reacting with other molecules. Therefore the

### How Light Intensity Effects The Rate Of Photosynthesis

1890 words - 8 pages In my investigation I am going to establish the effect of changing light intensity on the rate of photosynthesis.What is Photosynthesis?Photosynthesis is how plants get their food. The reasonwhy plants have leaves, roots or being green is all linkedto photosynthesis. In photosynthesis, a plant takescarbon dioxide from the air and water from the soil anduses the light from sunlight to turn them into food.Photosynthesis occurs only in the presence

### Determining The Effect Of Light Intensity On Photosynthesis

2519 words - 10 pages Determining the Effect of Light Intensity on Photosynthesis Aim In this experiment, I intend to alter the light intensity and measure its effect on photosynthesis through the production of oxygen Introduction Photosynthesis is the process by which green plants provide a source of energy for respiration. The formula is as follows- Carbon dioxide + water Carbon dioxide and water are chemically combined