(a) Identify THREE (3) differences between a permanent magnet DC motor and a separately excited DC motor. (b) Sketch the speed-current characteristic of separately excited DC motors. Analyze the speed-current characteristic and suggest why the difference between no-load and full- load speeds for large DC motors can be relatively small.

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Analog to Digital Converters

The analog-to-digital converter (ADC) allows circuits controlled by microprocessors, Arduinos, Raspberry Pi, and various reasonable digital circuits to be connected to the real world. In the real world, analog signals have a continuous stream of information from a variety of sources and sensors capable of measuring sound, light, temperature, or movement, in addition to the many digital systems that interact with their environment by measuring analog signals from those transducers.