A lightbulb has a 0.22m length of a tungsten wire filament. The filament has a resistance of 19 Ohms at 20 degrees celsius. The filament has a resistance of 240 Ohms when the lightbulb is operated at a potential difference of 120 volts. Please show all work for the following questions. A. Calculate the cross sectional area of the tungsten filament.
B. Explain why the resistance of the tungsten filament increases when the bulb is being operated compared to the resistance of the filament at 20 degrees celsius.
C. Calculate the power of the bulb when it is being operated at a potential difference of 120 Volts.

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.