G2 Gas Technician Module 11 Revised II Rated A

G2 Gas Technician Module 11 Revised II Rated A The unit of potential difference or electromotive force. Volt The amount of electrical current that will move through one ohm of resistance when a force of one volt is applied. Amperage (amps) How do you measure electrical power. Watt (p) How do you calculate wattage. P = E x I Electrical resistance measurement Ohms 1 watt equals how many btu? 3.41 btu How do you measure amps In series How do you measure volts In parallel How do you measure resistance? Isolate the device and read in series What are the components of an electrical circuit? Source, path, controllers, loads and fuses/circuit breakers, How do you designate a relay on a schematic diagram. The same way as the coil that operates it. What are the benefits of contactors over relays? They are heavier and can handle larger amounts of current. How do you rate a transformer? Volt-amps (VA) (E x I) The operating principle of a motor is based on? electromagnetism Where can you use NMD (non metallic dry) wire? Only in locations not exposed to moisture. Where can you use NMW (non metallic wet) wire? Can be used in damp locations Unsheathed conductors run outdoors must be in a? Liquid tight conduit When must you use BX cable? Must be run in steel stud or steel hoist applications. What is TEK? Watertight BX cable. What is the maximum size fuse for 14 gauge wire 15 amps What is the maximum size fuse for 12 gauge wire? 20 amps What is the maximum size fuse for 10 gauge wire? 30 amps What could happen if a circuit is fused higher then allowed? It may overheat the wire and cause a fire. What can conductors(wire) be made of? They can be solid or stranded What happens when the length of a conductor increases? The resistance increases. What happens as the diameter of a conductor increases? Resistance decreases ,What does an electrical distribution panel consist of? An electrical meter, a main switch disconnect, a distribution panel, fuses or circuit breakers and wire conductors. How man wires are contained in a residential service conductor? 4 - two hot, one neutral, one ground. ,What are the standards for a residential distribution panel? 240v, single phase, 60 hz. 240/1/60. 100 amps What is the purpose of breakers and fuses? They protect circuit conductors Where must you use a GFCI? Wet locations How often should you test a GFCI? Monthly 5 milliamps,How does a GFCI work? Senses a minute leakage of amperage to ground raceways or enclosures to the service equipment or system ground conductor.,What is a bonding conductor? A conductor which connects the non-current carrying parts of electrical equipment What is a grounding conductor? A permanent and continuous conductive path to the earth Single phase wiring. Two hot wires and one neutral for 240 v. 120 v has 1 hot wire and one neutral. Three phase wiring Three live wires and a ground. 208 or 575volts used in commercial and industrial applications. Has higher starting torque and lower amperage than single phase. Pictoral Diagrams Shows where the wires or components are physically located. Connection Diagrams Shows where wires are connected. Used for initial wiring or tracing wiring. Ladder or Schematic Diagrams Shows how the circuit works and what the components do. Single Pole Single Throw Switch What type of switch is this? Single Pole Double Throw (SPDT) What type of switch is this? A Double Pole, Single Throw (DPST) What type of switch is this? Double Pole Double Throw Switch (DPDT) What type of switch is this? Limit Switch - Normally Open What type of switch is this? Limit Switch - Normally Closed What type of switch is this? Pressure Switch - Normally Open What type of switch is this? Liquid Level Switch - Normally Closed What type of switch is this? Temperature Actuated Switch - Normally Closed What type of switch is this? Flow Switch - Normally Open What type of switch is this? Contact What symbol is this? AC Source What symbol is this? Transformer What symbol is this? Resistor What symbol is this? Solenoid/Gas Valve What symbol is this? Ground What symbol is this? Power or Control Fuse What symbol is this? Thermocouple What symbol is this? Thermister What symbol is this? Diode What symbol is this? Amperage How to measure electrical service supplied to a building? Ground Fault Circuit Interrupter (GFCI) A _________ would protect you from electrical shock near a pool heater. On the front Where do you reset the GFCI? Circuit conductors Fuses and circuit protect the ______ in an electrical distribution system. NMD (Non Metallic Dry) What conductor can be used in locations not exposed to moisture? Liquid Tight Conduit Unsheathed conductors run outdoors must be in....? Closed Safety controls are normally in the _________ position. Open Operating controls are normally in the _________ position.