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Line 142:
Line 142: − + + + − Part 1: Connect a DC power supply to the input and set it to 10V. Slowly adjust the potentiometer to determine how much voltage and current is needed to turn on the LED. Measure the voltage and current using the digital multimeter.+ − [[File:E W Circuit Pic.jpg|400px|thumb|right]] −
→Demonstration
==Demonstration==
==Demonstration==
[[File:E W Circuit Diagram.jpg|400px|thumb|right|Demo Circuit Diagram]]
[[File:E W Circuit Pic.jpg|400px|thumb|right]][[File:Resistor-color-chart.png|400px|thumb|right]]
Set up a breadboard with a 10kΩ potentiometer as a voltage divider. Connect an LED's anode (the longer leg) to the wiper of the potentiometer. Connect a 560Ω resistor to the cathode (the shorter leg), and connect the other side of the resistor to ground. See the demo circuit diagram to the right for reference.
Set up a breadboard with a 10kΩ potentiometer as a voltage divider. Connect an LED's anode (the longer leg) to the wiper of the potentiometer. Connect a 560Ω resistor to the cathode (the shorter leg), and connect the other side of the resistor to ground. See the demo circuit diagram to the right for reference.
[[File:E W Circuit Diagram.jpg|400px|thumb|none|Demo Circuit Diagram]]
Part 1: Connect a DC power supply to the input and set it to 10V. Slowly adjust the potentiometer to determine how much voltage and current is needed to turn on the LED. Measure the voltage and current using the digital multimeter.
Part 2: Disconnect the DC power supply from the input and connect the function generator to the input. Connect the oscilloscope probes to both the input and output of the potentiometer to display the waveforms. Set the function generator to a sine wave to turn the LED on and off. Experiment with a DC offset and a square wave.
Part 2: Disconnect the DC power supply from the input and connect the function generator to the input. Connect the oscilloscope probes to both the input and output of the potentiometer to display the waveforms. Set the function generator to a sine wave to turn the LED on and off. Experiment with a DC offset and a square wave.[[File:Resistor-color-chart.png|400px|thumb|right]]
[[File:E W Oscilloscope Screen.jpg|400px|thumb|none|CH 1: Function generator signal to the input. CH 2: Output of the circuit measured at V2]]
[[File:E W Oscilloscope Screen.jpg|400px|thumb|none|CH 1: Function generator signal to the input. CH 2: Output of the circuit measured at V2]]