The bulb

What is the resistance of a filament lamp when it is connected to a 9V battery and has a current of 120 mA?

Correct result:

R =  75 Ω

Solution:

U=9 V I=120 mA→ A=120/1000  A=0.12 A  R=U/I=9/0.12=75 Ω

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