1. What is the voltage in a typical electrical circuit (the type you plug an appliance into)? A.10 V B.50 V C.120 V D.220 V Measure the voltage of an outlet using a voltmeter. __________ volts Basic Electricity Terminology Volts: _____________________________ Amps: ____________________________

2. You plug a 1500 W hairdryer into the circuit. How many amps does the hairdryer draw? A.12.5 A B.110 A C.165000 A A basic equation of electricity is P = VI, where P is power, V is voltage, and I is current (amps). Basic Electricity

3. Volts and Amps To prevent excessive current (and a hazard), there are circuit breakers which trip if there the amperage is too high. At how many amps does a typical circuit breaker trip? A.10 A B.20 A C.50 A D.100 A

4. Volts and Amps To avoid excessive current, large appliances use a higher voltage circuit. What is the typical voltage of a clothes dryer circuit? A.220 V B.440 V C.880 V D.1000 V Where is 220 V a common voltage? ____________

5. Three-way switches Switch Voltage Source (Battery, Generator) Light Bulb (resistor) Often we want to have two switches control a light, such as having a switch at two different doorways. These are called 3-way switches. How would you wire the circuit so when either switch is flipped, the circuit will change (the light will go to the opposite state – either on or off)?

6. Three-way switches

7. Wire: Sizes AWGD (in )AWGD (in )AWGD (in )AWGD (in ) 0000 (4/0)0.4680.1285190.0359300.01 000 (3/0)0.409690.1144200.032310.00893 00 (2/0)0.3648100.1019210.0285320.00795 0 (1/0)0.3249110.0907220.0253330.00708 10.2893120.0808230.0226340.0063 20.2576130.072240.0201350.00561 30.2294140.0641250.0179360.005 40.2043150.0571260.0159370.00445 50.1819160.0508270.0142380.00397 60.162170.0453280.0126390.00353 70.1443180.0403290.0113400.00314 Wire Size : What size wire is typically used in a standard household circuit? A.10B.12C. 14

8. How do touchscreens work?

9. A simple model of a touchscreen Tape one transparency to the manilla folder. The transparency should be completely inside the folder. Cut 6 strips of aluminum foil to the required lengths. Take care to keep them flat and straight. 1” x 10” (4 required) 1” x 3.75” (2 required) 2012 ASEE Proceedings, Paper AC 2012-3301: A PHYSICS LABORATORY ACTIVITY TO SIMULATE THE OPERATION OF THE TOUCHSCREEN ON A SMARTPHONE. Gary P. Hillebrand, Meghann Norah Murray, Jenna Ross, Robert A Ross, Cherron Tarter.

10. A simple model of a touchscreen Tape the four 10” strips to the transparency as shown. Use the tape sparingly and avoid taping the shaded areas. Avoid taping the shaded areas.

11. A simple model of a touchscreen Cut four pieces of wire about 6” long. Strip the insulation off the ends, and twist the bare wire. Connect alternate vertical strips of foil with wire and fasten with tape.

12. A simple model of a touchscreen Cut one transparency in half lengthwise so it is 4.25” x 11”. Tape the 3.75” foil strips to one of the 4.25” x 11” transparencies as shown. Keep the tape away from the ends.

13. A simple model of a touchscreen Stack the two 4.25” x 11” transparencies on top of the large one with the blank one on top. Use a marker and draw 4 diamond shapes on the blank transparency at the intersections of the foil strips as shown.

14. A simple model of a touchscreen Cut holes in the transparency along the diamond-shaped lines. Do not crease the plastic.

15. A simple model of a touchscreen Assemble the touchscreen by placing the transparency with the 4 holes between the other two. The top transparency, with the 2 horizontal foil strips, should be foil-side down.

16. Place the 4 LEDs as shown. Make sure they are oriented correctly (the long wire will always be to the left). Tape them only to the outer strips of foil. The inside wire goes underneath the top transparency and rests on top of the foil Carefully bend the leads of the LED as shown. Long WireShort Wire Long Wire

17. A simple model of a touchscreen Connect the battery pack as shown in the schematic drawing. Positive: Red Negative: Black Try out the touchscreen.