1 hvacr214 – electrical for oil lesson 3 – electrical for oil
TRANSCRIPT
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HVACR214 – Electrical for Oil
Lesson 3 – Electrical for Oil
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Circuit
• An electrical circuit is a full path for electricity.
• A circuit must consist of 4 parts– Source– Switch– Path– Load
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Source
• A source for a circuit can be– A battery– A transformer (more on that later)– A wall electrical outlet– A power line– A breaker panel– A power plant
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Path
• A path for an electrical circuit could be– A wire– A circuit board– A piece of grounding strap
• A path must have a very low resistance, this allows electrons to move freely and without heat.
• A path with a high resistance will heat up.
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Switch
• A switch is basically a valve or gate that stops the free flow of electrons.
• It does this by opening the path.• Now we add two more terms:
– Open - A gap (or opening) in the path of a circuit that stops the flow of electrons.
– Closed - A path that is complete that allows the flow of electrons.
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Load
• The portion of an electrical circuit that actually does the work.
• This can be– A light bulb - the work is creating heat and
light– A motor - the work is turning the shaft.– A heat strip - the work is putting off heat.– A coil - the work is creating a magnetic
field.
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Picture of a circuit
•Pictures of circuits are called Schematic Diagrams.•These diagrams are composed of symbols that represent each part of the circuit.•These symbols are called schematic symbols.
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Schematic of a basic circuit
B1
SW1
L1 N
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Schematic of a switch
Single Pole - Single Throw Switch
Single Pole - Double Throw Switch
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Poles and Throw
Single Pole - Double Throw Switch
Pole
Throw
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Source on a schematic
• Can be labeled L1, L2, N, or anything else.• It is usually at one side of the schematic and
everything else works from there.
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Loads on a schematic
• Loads are shown by either an actual schematic symbol for the load or by a circle with a letter and a key.
• Loads are the portion of the circuit that does the work.
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A more complex schematic
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Shop Safety
• Make sure everything you are working with is unplugged and turned off when you are starting your assignment.
• Use black wire for line voltage source• Use white wire for line voltage neutral• Use red wire for control voltage source• Use orange wire for control voltage common
(neutral)
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Shop Safety
• Your instructor must check all circuits before you power it up. That means before you plug it in and turn it on the instructor must check it.
• Make sure the instructor initials your lab sheet.
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First shop project
• You are going to build a basic circuit.• Starting on page 13 of your electrical
handout you will follow the step by step procedures.
• Make sure you ask if you need help or have any questions.
• Everyone in the class is expected to wire and complete this assignment.
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Shop Circuit #1
B1
SW1
120V NSS