Resistance of the resistor

The resistor terminals have a voltage of 20 V and a current of 5 mA is passed through. What is the resistance of the resistor?

Correct result:

R =  4000 Ω

Solution:

U=20 V I=5/1000=1200=0.005 A R=U/I=20/0.005=4000 Ω

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