LukeJV8757
25.05.2021 •
Physics
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.
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Ответ:
answer:
step-by-step explanation:
the sum of the measures of the exterior angles of a shape is always 360 degrees.
so we are looking for a shape that has 360 degrees as the sum of the interior angles.
can't be 4) because a triangle has 180 degrees.
can't be 1) because a hexagon has 720 degrees.
can't be 3) because a pentagon has 540 degrees.
what about 2)? a quadrilateral has 4 sides so a square or rectangle are both possibilities (amongst others). both squares and rectangles have 4 right angles (four 90 degree angles). 4 x 90 = 360