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LAB 3: Electronics

November 22, 2008 By: Asli Category: Physical Computing

This week, we learned how to make circuits in parallel and in series, to measure voltage with a multimeter and to use the voltage regulator and DC power jack.
1st step: Here is circuit I made with a digital switch and the regulator. When the switch is off, the green LED is off; when the switch is on, the LED is turned on.

Green LED is off.

Green LED is off.

Green LED is on!

Green LED is on!

2nd step: 2 LEDs are connected in a series circuit, where they are sharing the power among each other. I used the multimeter to measure the voltage. I saw that each LED has 2.23 volts passing through and the voltage regulator has exactly 4.86 volts! So when components are connected in a series circuit, they share the voltage among each other equally and the sum of their volts equal to the overal voltage of the circuit.

LEDs in series

LEDs in series

3rd step: This time, 4 LEDs are connected in a parallel circuit. In parallel connections, all components have the same voltage, therefore they all have the same brightness. When I measured the voltage of each LED with a multimeter, it’s all the same: 4.15 volts. Here is the video.


LAB 3: Electronics from Asli Sevinc on Vimeo.

4th step: To generate a variable voltage, I used a potentiameter and measured the voltage with multimeter. The voltage ranges from 0 to 3.36 volts. Below is the video: (Unfortunately, I couldn’t fit the screen of the multimeter in the frame to show the numbers.)


LAB 3: Electronics / Potentiometer from Asli Sevinc on Vimeo.

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