Understanding Electrical Circuits: Components, Switches, and Troubleshooting, Slides of Applied Mechanics

Download Understanding Electrical Circuits: Components, Switches, and Troubleshooting and more Slides Applied Mechanics in PDF only on Docsity! Troubleshooting Electrical Circuits Docsity.com Interest Approach • Bring in a bag of popcorn • Have students visualize a romantic evening with their significant other watching a movie • When they try to pop the popcorn, sparks fly out of the outlet and the appliance won’t turn back on What Happened? Docsity.com What does the switch do? Hot Wire Neutral wire Single-Pole Switch Light Is this circuit open or closed? Docsity.com Example #2 • Diagram a circuit that has a duplex receptacle then 2 lights controlled by single-pole switches Docsity.com Hot Wire Neutral wire Which light is on? Docsity.com How does a four-way work? • The four-way switch makes and X between two 3-way switches. • LOOK!! 4-way Docsity.com Practice • Diagram electrical path through the following circuits 1. An open circuit consisting of a duplex receptacle and single pole switch controlling a light. 2. A closed circuit containing a light controlled by two three-way switches 3. The same circuit as Number 2 but with the electricity flowing through a different terminal 4. A closed circuit consisting of a light controlled by two three-way switches and a four-way switch. Docsity.com Review 1. What are the basic components of an electrical circuit? Source, switch, load, return to source 2. Given the logic diagram on the board, identify the components represented and state whether the circuit is open or closed. Docsity.com Fixing Circuit Problems • SAFETY FIRST • Process of Elimination -- Follow electricity from the source through the circuit until you find the problem. Retest circuit after making any changes • FIX THE PROBLEM Docsity.com SAFETY FIRST • Turn off circuit breaker before making any repairs • Read instructions that come with circuit testing equipment. – Power be turned off when using ohmmeters and continuity testers – Have electricity on when using voltmeters Docsity.com Process of Elimination • Remember that electricity has to flow from the hot wire through the load and then back to source on the neutral wire. • To find the break. Take a ride with the electricity and write down what you see. Docsity.com Docsity.com A. Overloaded Circuit – pulling too many amps A. Identified by several appliances stopping B. Caused by having too many appliances running on the same circuit. C. Commonly occurs when making a big breakfast Docsity.com Switches • Use a multimeter or continuity tester to make sure the switch works Multimeter Continuity Tester Docsity.com Loads • Use continuity tester to make sure the current can pass through the load • Attach one lead to the hot wire and the other to the neutral • If no connection exists, the appliance is broken. Docsity.com Testing Receptacles • Use receptacle tester to make sure receptacle is wired correctly Docsity.com Testing Neutral • Use continuity tester to test across any connection between the load and circuit breaker Docsity.com