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U3e-L12 March 31, 2008 DRILL A 75-watt light bulb is plugged into a wall socket (120V AC). What is the current going through the light bulb? (Use Joule’s.

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Presentation on theme: "U3e-L12 March 31, 2008 DRILL A 75-watt light bulb is plugged into a wall socket (120V AC). What is the current going through the light bulb? (Use Joule’s."— Presentation transcript:

1 U3e-L12 March 31, 2008 DRILL A 75-watt light bulb is plugged into a wall socket (120V AC). What is the current going through the light bulb? (Use Joule’s Law) What is the resistance of the light bulb? (Use Ohm’s Law) If three light bulbs are in series, what is the total resistance [use the answer from b) above]? Sketch a schematic If the two lights in series are plugged into a wall outlet, what is the current going through them [use the resistance from c) above]?

2 U3e-L12 DRILL – Solution A 75-watt light bulb is plugged into a wall socket (120V AC). What is the current going through the light bulb? (Use Joule’s Law) P = VI P = V I I = P/V I = 75W / 120V I = .625 A P = 75 watts V = 120 volts I = ? amps

3 U3e-L12 DRILL – Solution What is the resistance of the light bulb? (Use Ohm’s Law) V = 120 volts I = .625 amps R = ? V = IR V = I R R = V / I R = 120V / .625A R = 192 Ohms

4 DRILL – Solution R = 192 W + 192 W + 192 W R = 576 W
U3e-L12 DRILL – Solution If three light bulbs are in series, what is the total resistance [use the answer from b) above]? Sketch a schematic 192 Ohms R = 192 W W W T R = 576 W T

5 DRILL – Solution V = 120 volts R = 576 ohms I = ? V = IR
U3e-L12 DRILL – Solution If the two lights in series are plugged into a wall outlet, what is the current going through them [use the resistance from c) above]? V = 120 volts R = 576 ohms I = ? V = IR V = I R I = V / R I = 120 volts / 576 ohms I = .208 amps

6 ELECTRIC MOTOR PROJECT
U3e-L12 ELECTRIC MOTOR PROJECT Monday, Tuesday, Wednesday class time to complete the project By Friday have an operating motor Notes: Test electromagnet before constructing entire motor All angles must be precise, all parts must be correctly balanced, friction must be MINIMIZED Locate wires precisely

7 Orthogonal Views of Product SKETCH and LABEL
U3e-L8 Orthogonal Views of Product SKETCH and LABEL Motor Design, Design Drawings, and Lesson Courtesy of Fred Nastvogel

8 CUT WITH SCISSORS CUT WITH HACKSAW CUT WITH BAND SAW CUT WITH BAND SAW
U3e-L11 CUT WITH SCISSORS CUT WITH HACKSAW CUT WITH BAND SAW CUT WITH BAND SAW Motor Design, Design Drawings, and Lesson Courtesy of Fred Nastvogel

9 Motor Design, Design Drawings, and Lesson Courtesy of Fred Nastvogel

10 Orthogonal Views of Product SKETCH and LABEL
Motor Design, Design Drawings, and Lesson Courtesy of Fred Nastvogel

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