ELECTRICAL CIRCUITS
Constant voltage and current sources
Active and passive elements
C Kawerawera 0999220755 / 0888608859
1ELECTRICAL CIRCUITS - ELE-ELC-2-107/26/2021
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Understanding Electrical Circuits: Voltage, Current Sources, Batteries, and Power Supplies, Slides of Material Science and Technology
An in-depth exploration of constant voltage and current sources, including dc voltage sources like batteries and power supplies. Topics covered include the differences between primary and secondary batteries, ampere-hour rating, temperature effects, and the concept of ideal voltage and current sources. Additionally, the document discusses source conversions, parallel and series current sources, and passive and active elements in electrical circuits.
Typology: Slides
2020/2021
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ELECTRICAL CIRCUITS
Constant voltage and current sources
Active and passive elements
C Kawerawera 0999220755 / 0888608859
CIRCUIT THEOREMS AND ANALYSIS METHODS
BATTERIES
- (^) A battery consists of a combination of two or more similar
cells, a cell being the fundamental source of electrical energy
developed through the conversion of chemical energy and
establish a potential difference. They have a negative and
positive electrodes and an electrolyte between the electrodes.
- (^) Categories:
- (^) Primary type – non rechargeable eg. Alkaline and Lithium-
Iodine Primary Cells
- (^) Secondary type – rechargeable. The lead-acid unit (used
primarily in automobiles) and the nickel-cadmium battery (used
in calculators, tools, photoflash units, shavers, and so on).
Ampere-Hour Rating Batteries have a capacity rating given in ampere-hours (Ah) or milliampere-hours (mAh). A battery with an ampere-hour rating of 100 will theoretically provide a steady current of 1 A for 100 h, 2 A for 50 h, 10 A for 10 h, and so on, as determined by the following equation:
The capacity of a dc battery decreases at relatively (compared to room temperature) low and high temperatures. Maximum capacity occurring at 75 deg F (approx. 24 deg C)
The terminal voltage of a dc battery decreases with the length of the discharge time at a particular drain current.
Power Supplies – dc through rectification and filtering
dc current source
Ideal (constant) voltage and current
A current source determines the current in the branch in which it is located and the magnitude and polarity of the voltage across a current source are a function of the network to which it is applied. Find the source voltage Vs and the current I1 for the circuit
Determine the current I1 and the voltage Vs for the network
SOURCE CONVER SIONS