What is the voltage in a typical electrical circuit (the ty
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What is the voltage in a typical electrical circuit (the ty

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What is the voltage in a typical electrical circuit (the ty




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Slide1

What is the voltage in a typical electrical circuit (the type you plug an appliance into)?A. 10 VB. 50 VC. 120 VD. 220 V

Measure the voltage of an outlet using a voltmeter. __________ volts

Basic

Electricity

Terminology

Volts: _____________________________

Amps: ____________________________

Slide2

You plug a 1500 W hairdryer into the circuit. How many amps does the hairdryer draw?A. 12.5 AB. 110 AC. 165000 A

A basic equation of electricity is P = VI, where P is power, V is voltage, and I is current (amps).

Basic

Electricity

Slide3

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 AB. 20 AC. 50 AD. 100 A

Slide4

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 VB. 440 VC. 880 VD. 1000 V

Where is 220 V a common voltage? ____________

Slide5

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)?

Slide6

Three-way

switches

Slide7

Wire: Sizes

AWGD (in )AWGD (in )AWGD (in )AWGD (in )0000 (4/0) 0.4680.1285190.0359300.01000 (3/0) 0.409690.1144200.032310.0089300 (2/0) 0.3648100.1019210.0285320.007950 (1/0) 0.3249110.0907220.0253330.0070810.2893120.0808230.0226340.006320.2576130.072240.0201350.0056130.2294140.0641250.0179360.00540.2043150.0571260.0159370.0044550.1819160.0508270.0142380.0039760.162170.0453280.0126390.0035370.1443180.0403290.0113400.00314

Wire Size :

What size wire is typically used in a standard

household circuit

?

A. 10 B. 12 C. 14

Slide8

How do touchscreens work?

Slide9

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.

Slide10

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.

Slide11

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.

Slide12

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.

Slide13

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.

Slide14

A simple model of a touchscreen

Cut holes in the transparency along the diamond-shaped lines.

Do not crease the plastic.

Slide15

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.

Slide16

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 Wire

Short Wire

Long Wire

Long Wire

Long Wire

Long Wire

Slide17

A simple model of a touchscreen

Connect the battery pack as shown in the schematic drawing.

Positive: Red

Negative: Black

Try out the touchscreen.

Slide18

Slide19

Slide20

Slide21