20pcs Electronic DIY LED Dimming Lights Series and Parallel Circuit Technology Small Production Kit

Description The purpose of the experiment 1 Understand and recognize the light emitting diodes and illuminate the light emitting diodes LEDs 2 Understand the role of understanding resistance series and parallel resistance 3 Understand the self locking switch 4 Understand and recognize adjustable resistors and use adjustable resistors Experimental steps Step 1 The long leg of the light emitting diode LED is the positive pole and the short leg is the negative pole First the long wire of the LED is connected to the black wire negative electrode of the battery case and the short leg of the LED is connected to the red wire positive electrode of the battery case At this time the light emitting diode LED is not lit Then send it over again let the long leg of the LED connect to the red line of the battery box and the short leg of the LED is connected to the black line of the battery box At this time the LED lights up indicating that the LED is in one way operation and the single pass characteristic of the diode Step 2 In the circuit of the experimental step 1 a resistor of 220 ohms is inserted in series and the brightness of the LED lamp is lowered and the resistance hinders the current Step 3 Connect a 220 ohm resistor in parallel with the resistance in the circuit of the experimental board 2 The brightness of the LED is increased indicating that the total resistance of the resistor in the circuit is reduced after the resistors are connected in pa