Myke's Home Page

Book CD-ROM Home

File Copying/Harddrive Setup

Development Tools

Experiments

Projects

Useful Code Snippets and Macros

Introduction to Electronics

Introduction to Programming

Datasheets

PCBs

Links

McGraw-Hill Professional Publishing

"Current Consumption Check" Experiment

By simply placing an ammeter at the "Ground" connection to the power supply of the "LEDOn" experiment's circuit, the current required by the application can be measured. The diagram below shows how this would be done:

Before actually measuring the current required by the application (which is proportional to the amount of power dissipated by the circuit), I attempted to predict what the actual value would be. In the book text, you can see that my original assumption regarding the voltage across the LED was incorrect, but when the actual voltage across the device was factored into the circuit, then I found I could very accurately predict how much current would be required.

Click Here to look at the twentieth experiment - Debounce