# asli sevinc

telecommunicating

## 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 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

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.

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.)