what is the voltage in a typical electrical circuit (the type you plug an appliance into)? a.10 v...

What is the voltage in a typical electrical circuit (the type you plug an appliance into)?A. 10 VB. 50 VC. 120 VD. 220 VMeasure the voltage of an outlet using a voltmeter. __________ volts

Basic Electricity

Terminology

Volts: _____________________________

Amps: ____________________________

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

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

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? ____________

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)?

Three-way switches

Wire: Sizes

AWG D (in ) AWG D (in ) AWG D (in ) AWG D (in )

0000 (4/0) 0.46 8 0.1285 19 0.0359 30 0.01

000 (3/0) 0.4096 9 0.1144 20 0.032 31 0.00893

00 (2/0) 0.3648 10 0.1019 21 0.0285 32 0.00795

0 (1/0) 0.3249 11 0.0907 22 0.0253 33 0.00708

1 0.2893 12 0.0808 23 0.0226 34 0.0063

2 0.2576 13 0.072 24 0.0201 35 0.00561

3 0.2294 14 0.0641 25 0.0179 36 0.005

4 0.2043 15 0.0571 26 0.0159 37 0.00445

5 0.1819 16 0.0508 27 0.0142 38 0.00397

6 0.162 17 0.0453 28 0.0126 39 0.00353

7 0.1443 18 0.0403 29 0.0113 40 0.00314

Wire Size : What size wire is typically used in a standard household circuit?A. 10 B. 12 C. 14

How do touchscreens work?

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.


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.


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.


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.


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.


Cut holes in the transparency along the diamond-shaped lines.Do not crease the plastic.


Assemble the touchscreen by placing the transparency with the 4 holes between the othertwo. The top transparency, with the 2 horizontal foil strips, should be foil-side down.

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


Connect the battery pack as shown in the schematic drawing.

Positive: Red Negative: Black

Try out the touchscreen.

what is the voltage in a typical electrical circuit (the type you plug an appliance into)? a.10 v...

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