040914 Physics 4B

Today started with a quiz on displaying a bright or dim setting. Our part of the quiz was to display a bright setting. Unfortunately, we were unsuccessful. To get a bright setting a person would put the batteries in series to and line the light bulbs parallel. To get the dim setting a person would put the batteries in series but would put the light bulbs in series also to make the power go through more wires.

 Quiz Apparatus  

Water experiment calculations 

 This graph shows the change of temperature in the water. Blue using the 9V and Red using the 4.5V 

This the list of values given during the experiment 

Experiment 1 Calculations                                          Experiment 2 Calculations 

For the first experiment with using 4.5V the change in temperature was  2.45 +/- 1.25 degree C/ kelvin
For the second experiment with 9V the change in temperature was 9.79+/- 5.00 degrees C/ Kelvin. A person would guess that doubling the voltage would double the change in temperature but this it not the case it is roughly 1: 5. This could be from the the greater difference between the voltage and the resistance in the wire. This gap increased the power with in turn increased the change in t temperature

The last experiment was  cooking of the Hot dog. Using the out let two cook the hotdog it would be the equivalent of a person absorbing that same amount of voltage. On top were three Green LEDs with varying distance small medium and large separation of the anode and cathode. According to the experiment the larger the gap between the anode and cathode the brighter the LED.