The purpose of this lab is to decide how to build up a circuit that a 5V LED and 3V LED will glow and not blow up. First, we built a parallel circuit for both LEDs. However, only putting the LEDs in the circuit is not good enough. The LED will blow up quickly as we turn the battery source on. Therefore, we put a resistor in front of each LED to reduce current through them. Then we insert a current meter between the LED and 1 resistor and a voltmeter across 1 of the LED to test the current and voltage. Finally, we could use calculation to find the best resistor to fit in the circuit and not make the LED to blow up, and choose the one from the reality that we are possible to use.
R for 5V LED = 150 ohm
R for 3V LED = 360 ohm
Efficiency: 41.6%
This is the picture of a blown up LED
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