An 150 Wan light bulb sold at Public is designed to operate a When connected to

Question

An 150 Wan light bulb sold at Public is designed to operate a When connected to this voltage of 120 V. When connected to this voltage: what current is circulating through the bulb's filament? what is the resistance of the filament? what is the cost of operating the light bulb as a "thieve chaser" during a whole month vacation (30 days ) if FPL charges 9 cents the KWH (kilowatt-hour)? Is the resistance calculated in part (b) applicable when the bulb if fully illuminated? when it is not lighted at all?

Explanation / Answer

P =150 W, V=120 V

(a) P =VI

I = 150/120 =1.25 A

(b) From ohms law

V =IR

R = 120/1.25 =96 ohm

c) P = Q/t

Q =Pt =150 *30*24/1000 =108 kWh

9 cents per 1 kwh

total Cost for operating light bulb = 9*108 = 972 cents

d)

1) No

2) Yes

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