Jan 252011
 

Lets create a circuit that tests to see how different resistors affect the brightness of an LED. The voltage you should use is 9 volts, the red wire will be positive and the black wire is negative.

Set up your board similar to this, using the 4 resistors listed below and 4 LEDs of the same color.

Questions:

Fill in the table

Resistor Total voltage
from source
voltage used
across resistor
voltage used
across LED
LED brightness
(order them 1-4)
330
470
1000
10000

What does increasing the resistance do to the voltage measurement of the LED?

What does increasing the resistance do to the brightness of the LED?

 Posted by at 1:57 am

 Leave a Reply

(required)

(required)

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>