1/08/14 Day 2 Elec 10

Day 2: Using a Multimeter to measure different outputs and learning about different resisters

Experiment 1: Using the multimeter we tested a 9 volt and 1.6 volt battery, wall adapter(not displayed), potentiometer, and a light sensor    

    Experiment 2: Using different resisters to determine why LED's shine brighter
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Experiment 1

Notes:  - Wall adapters when unregulated can vary from printed label

              - Batteries are Direct current and outlets in U.S. are Alternating Current  

              - Moving the potentiometer halfway should create half the total value 

              - Light senors: the more light the lower the ohms and less light the higher the ohms 

Experiment 2   

Types of resistors used: 100ohm, 1K ohm, and 10K ohm.
Note: the higher the resister the dimmer it became. From picture lists 1K ohm, 100 ohm, and 10K ohm
 

Using a 10K potentiometer and a 100 ohm resistor with wires creating a circuit.
Results in varying brightness when knob of potentiometer is twisted.

I assume that the 100 ohm resister is there so when the potentiometer is at 0 resistance the LED will not burn out