Page 25 - Robo_Genius_V1.0_flipbook_C8

Step 14 Connect the middle terminal (wiper) Step 15 Now, rotate the knob of the potentiometer
of the potentiometer to the resistor’s and observe that the brightness of the
second end as shown in the image. LED will change accordingly.

Connect a
wire here

Circuit Operation

When the circuit is powered on, the potentiometer controls the amount of current flowing to the
LED. By turning the knob of the potentiometer, you change its resistance, which in turn adjusts the
brightness of the LED. Lower resistance allows more current to flow, making the LED brighter, while
higher resistance reduces the current, dimming the LED.

Concept

This activity demonstrates the relationship between resistance, current, and brightness using Ohm’s
Law. A potentiometer is a variable resistor that can control the amount of current flowing in the
circuit. The more resistance the potentiometer provides, the less current flows, and vice versa.

Observation

Students will observe that when they turn the knob of the potentiometer, it changes the resistance
in the circuit, which alters the brightness of the LED. Turning the potentiometer one way will make
the LED brighter and turning it the opposite way will make the LED dimmer.

Application

Volume Control in Audio Equipment: Potentiometers are commonly used
in radios, speakers, and other audio devices to adjust the volume.

Electronics with Breadboard-Based Kit 23