25.36. If a "75-W" bulb (see Problem 25.35) is connected across a 220-V potential difference (as is used in Europe), how much power does it dissipate? Ignore the temperature dependence of the bulb's resistance.

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Nelly StrackeLv2

22 Aug 2018

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how much power is dissipated in a light bulb that is normally rated at 75 w

The power rating on a light bulb indicates how much power it would dissipate when it is hooked up to the standard household voltage of 120 V (this rating does not mean that the light bulb always dissipates the same amount of power, assume that the resistance is constant in this case).

A. How much power is dissipated in a light bulb that is normally rated at 75 W, if instead we hook it up to a potential difference of 60 V?

B. How much power is dissipated in a light bulb that is normally rated at 75 W, if instead we hook it up to a potential difference of 120 V?

crimsonhornet772

The length of a 60 W, 240 ohms light bulb filament is 60 cm.

1) If the potential difference across the filament is 120 W, whatis the strength of the electric field inside the filament? E =V/m
2) Suppose the length of the bulb's filament were doubled withoutchanging its diameter or the potential difference across it. Whatwould the electric field strength be in this case? E = V/m
3) Remembering that the current in the filament is proportional tothe electric field, what is the current in the filament followingthe doubling of its length? I = A
4) What is the resistance of the filament following the doubling ofits length? R = ohms

The length of a 60 W, 240 light bulb filament is 60 cm.

1) If the potential difference across the filament is 120 V, what is the strength of the electric field inside the filament?

2) Suppose the length of the bulb's filament was doubled without changing its diameter or the potential difference across it. What would the electric field strength be in this case?

3) Remembering that the current in the filament is proportional to the electric field, what is the current in the filament following the doubling of its length?

4) What is the resistance of the filament following the doubling of its length?