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An incandescent light bulb is rated at 100 W when the applied voltage is 120 V.
(a) What is the resistance of the bulb when it is operating?
(b) A hot tungsten filament in a bulb has a temperature of about 2520°C. Find the ratio of resistances when the filament is hot to when it is cold, a temperature of 20°C.
(c) What is the resistance of your bulb when it is cold?
(d) When is the current through the bulb larger? (This helps explain why bulbs burn out when switched on.)When it is hot When it is cold
(e) The diameter of the wire in a filament is about 0.12 mm. How long is the filament in your bulb?
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A sphere of mass 3.00 g is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes a constant angle of 28.0° with the vertical. Determine the tension in the cord
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To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, Over what distance must the lens be movable
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