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Concept
Components of a Circuit: Learning about resistors, potentiometers, and LEDs.
Simple Circuits: Creating circuits using a breadboard to dim an LED.
Understanding Components: Familiarization with how resistors and potentiometers work to
adjust current flow.
Proportions and Ratios: Understanding how changing resistance alters the current and
brightness of the LED.
Observation
In the “Light Dimmer” activity using a breadboard, students can observe how adjusting a
potentiometer changes the brightness of the LED. As they turn the knob, they will see the LED get
brighter or dimmer, illustrating the effect of varying resistance on current flow. If the LED doesn’t
respond as expected, students can check their connections and ensure the potentiometer is wired
correctly. This activity helps reinforce concepts of circuits, resistance, and how components work
together to control light intensity!
Applications
Volume Control in Audio Equipment: Potentiometers are commonly
used in radios, speakers, and other audio devices to adjust the volume.
Light Dimming in Lamps: Potentiometers
are used in dimmer switches to control
the brightness of lights. By adjusting the resistance, users can set the
desired light intensity in their homes or offices.
Light Dependent Resistor (LDR) Circuits
Light Dependent Resistor (LDR) circuits are used to detect and respond to changes in light levels,
making them useful in various automatic lighting and sensing applications.
LDR Sensor
An LDR is also known as photoresistor. “Photo” means light, so a photoresistor is
a resistor that responds to light.
When it’s dark, the LDR has high resistance, which means
it doesn’t let much electric current pass through.
When its light, the LDR has low resistance, which means it
lets more electric current pass through.
Inside the LDR, there are materials that react to light.
When light hits the LDR, these materials change their
properties, reducing resistance and allowing more current to flow.
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