Output Devices

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 Objective of this Week

  • Measure the power consumption of an output device.

DC Power Supply

A variable power supply is an electronic device that provides adjustable output voltage and/or current to power and test electrical and electronic circuits.

  • Adjustable Output – You can set desired voltage (e.g., 0–30V) and current (e.g., 0–10A).

  • Versatile Use – Suitable for multiple applications like motors, microcontrollers, LEDs, etc.

  • Real-Time Monitoring – Digital displays show live voltage and current values.

  • Built-in Protections – Prevents damage due to short circuits, overloads, and overheating.

  • Precise Testing – Helps analyze circuit behavior under various power conditions.

  • Safe for Learning – Common in labs and training setups for electronics education.

  • Long-Lasting – High-quality units can operate continuously with proper ventilation.

Specification

ParameterSpecification
TypeVariable DC Power Supply
Maximum Output Voltage30 V DC
Stable Output Voltage24 V DC
Maximum Output Current10 A
Stable Output Current5 A
Output Power120 W
Voltage AdjustabilityYes (Variable)
ApplicationElectronics Testing, Prototyping, Lab Use

How to use

  • Connect the supply to AC power and switch it on.

  • Set voltage and current using control knobs or buttons.

  • Connect the load (circuit or device) to the output terminals (usually red = +, black = −).

  • Monitor the readings on the digital display.

  • Adjust as needed while watching the current limit to avoid overload.

Safety Precautions

  • Always start with low voltage and gradually increase.

  • Never exceed the rated voltage or current of the connected device.

  • Use proper heat dissipation and ventilation.

  • Ensure correct polarity before connecting.

  • Turn off the supply before wiring changes.

Testing

Dc motor Voltage and Current checking

I connect the DC motor with potentiometer to vary the load of the motor

Set the Voltage as 5V

Run the Motor with actuating the potentiometer and reading the Current value

Amps flucutuate more or less 1 A, it is the safety Amps too.

As we can see the Motor fluctuating maximum upto 1.1A at 5V

V = 5V

I = 1.1A

P = V*I

P = 5.5W

Conclusion

Learning outcomes

  • By using the DC power supply we can run some output devices which is only want the power.

  • Know about how to calculate the power of our output devices