The tungsten filament of an incandescent bulb has an equivalent resistance of 0.29 mΩ (290000Ω) at 37˚C. After being used for several hours the resistance is found to be 0.33mΩ (330000Ω). Determine the temperature of the coils at this time. The temperature coefficient and resistivity of tungsten at 20˚C is 0.0045 C-1 and 5.51 x 10-8Ω·m, respectively.
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
The tungsten filament of an incandescent bulb has an equivalent resistance of 0.29 mΩ (290000Ω) at 37˚C. After being used for several hours the resistance is found to be 0.33mΩ (330000Ω). Determine the temperature of the coils at this time. The temperature coefficient and resistivity of tungsten at 20˚C is 0.0045 C-1 and 5.51 x 10-8Ω·m, respectively.
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