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An incandescent lamp is operated at 120 V, and the current is 0.5 A. So, the resistance of the lamp is:

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*\\From\ Ohm's\ Law:\\\\ Current=(Voltage)/(Resitance)\\\\ Current*Resistance=Voltage\\\\ Resistance=(Voltage)/(Current)\\\\ Resistance=(120V)/(0,5A)\\\\ Resistance=240\ Ohms
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