1. EET 110 - Survey of Electronics Chapter 25 - Appliance Cords & Connections Chapter 26 - Lighting Equipment

2. Types of electrical Cords SPT parallel Lamp cord –thermoplastic - lamps, etc HPN parallel Lamp cord –thermosetting - heaters, etc SVT vacuum cleaner cord –thermoset or thermoplastic w/ thermoplastic outer shell

3. HPD heater cord –twisted thermoset, asbestos fill, and cotton or rayon braid cover JS junior hard service –twisted thermoset, cotton fill, rubber jacket

4. Cord Connectors Two prong plug cap three wire plug cap –note black to brass term, white to silvered, green(bare) to green (ground) cords –three wire extension cord –appliance plug heating element appliances

5. Grounding Appliances Range and dryer receptacles –remember that ground wire is for protection Grounded appliances must be connected to the protective ground circuit. –Bonded to metal cases Double-insulated appliances –an extra layer of insulating material

6. Ground Fault Circuit Interrupter GFCI detects current flow through ground connection –compares hot current to neutral current –breaks circuit if not equal Test button –tested once per month

7. note GFCI does not include circuit breaker protection GFCI breaker may be used to protect an entire circuit

8. Weatherproof fixtures water resistant boxes, with covers for outlets, receptacles and lamps are available –metal or PVC –Caps on outlets –rubber gaskets for plates and lamp holders

9. Chapter 26 - Lighting Equipment Incandescent lamps –tungsten filament gives off light when hot waste energy as heat –Rated in Watts (volts) Lamp Bases –see figure 26-4

10. Trilight lamp –high, med, low settings –40W and 60 W filaments - combined to give 100W Replacing lamp socket –lamp fixture Installing a light fixture –ceramic

11. Lamp types recessed fixtures track lighting

12. Fluorescent lighting heat mercury in neon or other inert gas to ionize inner coating (phosphorus) gives off light when exposed to UV Ballast –provides starting voltage, –then limits current to hot tube

13. Preheat Fluorescent Light circuit –push button to head gas first to ionizing temp –then voltage is applied high due to collapsing magnetic field double pins Glow-switch starter –bimetallic strip provides contact/break

14. Rapid start –ballast quickly heats the mercury –1-2 second response Instant Start –single pin at each end. –Ballast provides voltage start

15. Compact fluorescent bulbs –energy efficient lighting High-Intensity Discharge lamps –halogen lamp is an example

16. Security Lighting photoelectric control unit –CdS cell to monitor and turn on the light fixture Light timers Motion Sensors Remote control lighting systems –X10 - home control units.

17. Chapter 30 – Capacitors & Inductors Inductors – coils of wire –Stores current in magnetic field –Measured in Henrey’s L –Opposes changes in current flow –Mutual and Self inductance

18. Inductive Reactance Equivalent to Resistance XL = 2  fL – Measured in Ohms –Example 30-4 if 200mH inductor is operated at 1000Hz, what is the Inductive Reactance XL = 2  fL = 2 x 3.14159 x 1000 x 200 x 10-3 = 1256  –L T series = L1 + L2 + L3 +… –LT (parallel) = L1 x L2/(L1 + L2)

19. Capacitance Voltage is stored in electro-static field Plates separated by electrolyte RC time constant –t = RC Capacitive Reactance XC = 1/(2  fC) –Measured in Ohms