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
makes me get the best readings for the earlier voltages when the bulb
is dim. It als...
... middle of paper ...
...DR is slightly
faulty. This would not make a large difference, but would make me feel
that the test is that bit fairer.
These could all be incorporated into the method, and if I did this
experiment again, I could add these extra points to the method
§ Keep a cover on the bulb to make sure all the light hits the LDR
§ Use the same practical equipment
§ Try to work as far away from other people as possible.
Other than that I think the method works well. I left out the points
regarding letting the system cool down, as there is not enough time to
do the experiment in, and I could certainly not use a whole day to
take results. If I had the time, I would also try to take more sets of
readings, up to 10 sets, to get the best graphs. However, the above
points are a realistic way of improving my results next time.
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