Direct Current (dc) Electronics
Dale R. Patrick, Stephen W. Fardo · River Publishers eBooks · 2020
This chapter deals with a basic topic in the study of electronics-direct current (DC). It discusses topics such as basic electrical systems; energy and power, the structure of matter, electrical charges, static electricity, electrical current, voltage, resistance, and measuring instruments. A flashlight is a device designed to serve as a light source in an emergency or as a portable light source. In a strict sense, flashlights can be classified as portable electronic systems. They contain the four essential parts needed to make this classification. A large portion of the automatic machinery being used by industry today receives instructions through digital signals. A digital, or numerical, system is therefore a very important part of the electronics field. The readout of a digital meter is designed to transform electric signals into numerical data. Both letter and number readouts are available, as are seven-segment, discrete-number, and bar matrix displays.