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    Determining Resistance, Cross Sectional Area and Current

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    A standard 100 Watt (P = 100 W at 120 volts) light bulb contains a 7.10 cm -long tungsten filament. The high-temperature resistivity of tungsten is 9x10^-7 ohms/meter.

    (a) What is the Resistance of this tungsten filament?

    (b) What is the cross sectional area of this filament?

    (c) What current is flowing throw this bulb?

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    This solution provides steps to determine resistance, the cross sectional area and current.