By Bennie Sparkman Stephen L. Herman
Now in its 6th variation, electrical energy AND CONTROLS FOR HVAC-R equips readers with the data had to paintings successfully with all kinds of automobiles and keep an eye on units present in the heating and air-conditioning undefined. previous wisdom of electrical energy isn't required as this ebook starts off with dialogue of crucial simple electrical energy and electric circuits techniques. quite a few schematic diagrams and step by step troubleshooting methods are incorporated to acquaint readers with the entire sorts of circuits regularly encountered within the HVAC-R box.
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Extra info for Electricity and Controls for HVAC-R, Sixth Edition
Notice that the meter is clamped around only one of the power lines. If the meter is clamped around AC LINE Figure 3–13 A current transformer provides different scales. (Source: Delmar/Cengage Learning) more than one line, the magnetic fields of the wires cancel each other and the meter indicates zero. This type of meter also uses a current transformer to operate the meter. The jaw of the meter is part of the core material of the transformer. When the meter is connected around the current-carrying wire, the changing magnetic field produced by the AC current induces a voltage into the current transformer.
R ϭ E ϭ 220 V R ϭ 10 ⍀ E ϭ 120 V I ϭ3A 5. 2A V = ________________ 4. E ϭ I ϭ1A R ϭ 240 ⍀ UNIT 4 Electrical Circuits 6. 2A 30 Ω V = ________________ 30 Ω PRACT ICE PROBL EMS SE T 3 Ohm’s Law 1. 120 V 10 Ω 10 Ω IT = ________________ 2. 10 Ω 120 V 10 Ω IT = ________________ 10 Ω 3. 240 V 10 Ω 10 Ω 5Ω IT = ________________ 47 48 SECTION 1 Basic Electricity 4. 10 Ω 240 V 10 Ω IT = ________________ 48A PRA CT ICE PROB LEMS SE T 4 Ohm’s Law 1. E ϭ 2. I ϭ I ϭ1A R ϭ 12 ⍀ 3. R ϭ E ϭ 220V Rϭ5⍀ E ϭ 120V I ϭ5A 50 Ω 5.
This meter is used to measure the amount of fuel in the tank of an automobile. Most people can glance at the pointer of the meter and know that the meter is indicating that there is one-quarter of a tank of fuel remaining. Now assume that the tank has a capacity of 20 gallons. The meter is now indicating that there are a total of 5 gallons of fuel remaining in the tank. Learning to read the scale of a multimeter is similar to learning to read a speedometer or fuel Figure 3–7 Fuel gauge. (Source: Delmar/Cengage Learning) Figure 3–8 Multimeter face.