Chapter 22 Electrical Systems. Textbook page 169, 171.

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Presentation transcript:

Chapter 22 Electrical Systems

Textbook page 169, 171

Alternating Current

DC Alternators

Electrical Units of Measure Voltage (pressure) unit of measure is the Volt Current (flow) unit of measure is the Ampere (amp) Resistance (friction) unit of measure is the Ohm Power (force) unit of measure is the Watt

Voltage– Voltage symbol is traditionally “E” for ElectroMotive Force (EMF) Current– Current symbol is traditionally “I” for Intensity Resistance– Resistance symbol is “R” in equations and the Greek symbol omega Ω for values Power – Power symbol may be “P”ower or “W”atts

Ohms Law

Block Diagrams A block diagram is used as an aid for troubleshooting complex electrical and electronic systems. A block diagram consists of individual blocks that represent several components, such as a printed circuit board or some other type of replaceable module.

Pictorial Diagrams In a pictorial diagram, pictures of components are used instead of the conventional electrical symbols found in schematic diagrams. A pictorial diagram helps the maintenance technician visualize the operation of a system.

Schematic Diagrams A schematic diagram is used to illustrate a principle of operation, and therefore does not show parts as they actually appear or function.