Investigating the Brightness of Light Shining on the Light Dependant Resistor
The aim of my investigation is to investigate how the brightness
(intensity) of light shining on the LDR (Light Dependant Resistor)
affects the Resistance.
We can change the intensity using different methods. One method is to
increase the voltage, by plugging the power supply to a higher
voltage. But this method can be hard as you might not be able to know
how higher the voltage is, it might be harder to have access to higher
voltage, as it is dangerous.
Another way is to change the brightness by adjusting the power supply.
Also the distance between the bulb and the LDR is another method, if
the distance is bigger, the less bright it would be. If the distance
is less/smaller, the denser it will be.
We could also use different bulbs and power supply, with a higher
voltage and energy, the higher the voltage, the brighter the light
bulb. But this may be hard, as we might not have many different power
supplies or bulbs. I could also put different densities of filter
between the bulb and LDR. The last method that I could use is to use
different sizes of the apertures used in the experiment. If an
aperture is more open, then more light will flow through, but if the
aperture is more closed then light will hardly pass through.
I am going to use the method of changing the distance, because this is
the easiest method to carry out. Also the results from this method of
experiment would be more accurate as it is easy to record the results
through this method.
We will send the current through the LDR; a Voltmeter/Ammeter will
measure the current.
The measurement unit 'Amps' (A) is not sensitive enough to measure
smaller current; therefore we measured the current in 'Milliamps'
(MA).
From my Preliminary Study, I have discovered the appropriate distances
that I will use in my final experiment.
As there will be 5 readings, there will be 5 different distances.
measure it. Then I would use a spirit to light it and put it under the
Using the apparatus listed above I will set up the following circuit: [IMAGE] [IMAGE] [IMAGE] [IMAGE] [IMAGE] [IMAGE][IMAGE][IMAGE][IMAGE]Key [IMAGE] [IMAGE]Variable resistor [IMAGE] [IMAGE][IMAGE]Ammeter [IMAGE] [IMAGE] [IMAGE] Lamp [IMAGE] [IMAGE]Voltmeter [IMAGE] [IMAGE] [IMAGE] [IMAGE] [IMAGE][IMAGE][IMAGE]Battery pack [IMAGE] [IMAGE] [IMAGE]Lead 2. I will do a preliminary test to find the range of current in amps. I will do this by moving the variable resistor to its lowest and highest points and noting down the amps. In this case the lowest point is 0.5 and the highest is 1.6 amps. 3.
I will make it a fair test by having all variables such as heat and
method I measured all of the six circles. After I had this data, I went back and
Light dependent reactions are the effects that occur in photosynthetic organisms in response to solar energy and is the initial process of photosynthesis. Another name for light dependent reactions is, non-cyclic photophosphorylation. The site of these reactions occurs within the chloroplast in what is known as the Thylakoid membrane. Light is absorbed by something called photosystems (PSI AND PSII) and is part of all photosynthetic organisms. The light energy collected in this process will later become chemical energy. The process starts out with the excited electrons in PSII and then PSI. These electrons become excited from the absorption of light. The high energy electrons in PSI go down something called the electron
The Calvin cycle occurs in the liquid of the chloroplasts of the plant, called the stroma.
The story that is most significant to me is “Reading the Light'; by Roger Pfingston. This story felt like it was written from the heart. It is filled with emotions, ones that the author caught in his story very well. Even though I could not empathize with Brian, I did feel sympathetic towards him. When David said to Brian, “Is it really such a surprise? I’m sure you know that your mother and I haven’t been the best of friends lately.'; (6), that was a shock to me. David did not seem to be sympathetic towards his son; instead he made it sound like it had happened and that there was nothing that could be done about it. At the end of the story, David, Maria and Brian went to the park where the author stated “The three of them stood huddled in the glare of ice and sun.'; (7) My heart sank. They just stood there accepting that their family was breaking up. I thought that Roger Pfingston wrote this story from his heart. I was able to put myself in Brian’s place and actually feel how I thought he would feel.
the nail. We then switched on the power supply and set the voltage to 4 V. We tested the number of paper clips the nail would pick up, each. time turning the power supply off and winding the coil five more times.
A halogen bulb light source was set up at the end of a yardstick, and a light sensor was set up on the yardstick beginning at 0.1m from the light source. Science Workshop was again used to measure the intensity of light ranging from 0.1m to 1.00m (Fig.
Increasing the light intensity will make photosynthesis faster. Variables: In this experiment there are a few things we have to keep the same.
Exploration of the Principles of Lighting In this report I will be explaining the major and minor principles of lighting, the purpose of key, fill, black and background lighting along with the purpose of high and low keylighting. I will also be including detailed diagrams of two scenes from a film I have worked on. The more modern day purposes of lighting are in particular for it to create a sense of realism.
My aim is to try and find out how much the voltage is affected when
...otentiometer until the circuit was working, then took it out and measured the resistance, which was 4.79kΩ, I then got a resistor you can fine tune with a screw driver and set it to the same as what the potentiometer was.
Turn the lamp on and start timing it as soon as the edge of the solution starts moving. After ten minutes measure and write down in millimeters the distance the edge moved.
Imagine that you are going to design and perform the experiment described in the dialogue.