An incandescent light bulb is rated at 100 w when the, Physics

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An incandescent light bulb is rated at 100 w when the

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.

(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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