A current of 0.5 A flows in a 60-W light bulb when the voltage difference between the ends of the filament is 120 V. What is the resistance of the filament?

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Answer 1 · 2018-04-12T02:50:03

#R = 240" "Omega#

The equation for resistance is:

#R = V/I#

where #R# is the resistance, #V# is the voltage, and #I# is the current.

NOTE: It is important to use a consistent set of units; the two most common sets are Ohms, Volts, and Amperes and kiloOhms, Volts and Milliamperes.

We are given #I = 0.5" A"# and #V = 120" V"#, therefore, the equation will produce an answer in Ohms:

#R = (120" V")/(0.5" A")#

#R = 240" "Omega#