Online Resource for ETCH 213
Faculty: B. Allen
Introduction to Direct Current
(DC)
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ETCH 213: Introduction to Direct Current (DC) - Source, Load, and Generation - Prof. Bret , Study notes of Electrical and Electronics Engineering
This online resource for etch 213 provides an introduction to direct current (dc), covering the concepts of sources, loads, and various methods of dc generation. Topics include mechanically generated dc through the piezoelectric effect, thermally generated dc using thermocouples, optically generated dc via photovoltaic cells, magnetically generated dc, and chemically generated dc through voltaic cells. The document also discusses the calculation of ampere-hours and the use of batteries in series, as well as equipment protection through fuses and circuit breakers.
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Pre 2010
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Online Resource for ETCH 213 Faculty: B. Allen
Introduction to Direct Current
(DC)
Online Resource for ETCH 213
Source and load
Source โ A device that supplies the signal,power, or electric energy to a load.Load โ A component, circuit, or piece ofequipment connected to the source. The loadresistance will determine the load current.Load Resistance โ The resistance of the load.Load Current โ The current that is present inthe load.
Online Resource for ETCH 213
Direct current sources
Mechanically generated DCThermally generated DCOptically generated DCMagnetically generated DCChemically generated DCElectrically generated DC
Online Resource for ETCH 213
Mechanically generated DC
Piezoelectric Effect โ The generation of avoltage between theopposite sides of apiezoelectric crystalas a result of a pressureor twisting.
Online Resource for ETCH 213
Optically generated DC
Photovoltaic Cell โ A solid state device thatgenerates electricity when light is applied.Also called a solar cell.Photovoltaic action โ The development of avoltage across the junction of two dissimilarmaterials when light is applied.
Online Resource for ETCH 213
Magnetically generated DC
Online Resource for ETCH 213 Secondary Cell โ An electrolytic cell forgenerating electrical energy. Once discharged,the cell my be restored or recharged by sendingan electric current through the cell in theopposite direction to that of the dischargecurrent. Wet Cell โ Cell using a liquid electrolyte.
Online Resource for ETCH 213 Faculty: B. Allen
Ampere-hours
Ampere-Hours โ The product of the currentsupplied and the time in hours the current wassupplied. Ampere-Hours = current
ร
hours
Online Resource for ETCH 213
Electrically generated DC
Online Resource for ETCH 213
Equipment protection
Fuse โ This circuit - or - equipment-protecting device consistsof a short, thin piece of wire that melts and breaks the currentpath if the current exceeds a rated damaging level.Circuit Breaker โ A reusable fuse. This device will open acurrent-carrying path without damaging itself once the currentvalue exceeds its maximum current rating.Thermal-Magnetic โ Thermomagnetic circuit breakers.
Online Resource for ETCH 213
Protoboards
Protoboards โ An experimental arrangement of a circuit on aboard. Also called a breadboard.
Online Resource for ETCH 213 Faculty: B. Allen