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 answer:

R =  4000 Ω

Step-by-step explanation:

$$\begin{gathered} U=20\text{ V } \\ I=5\mathrm{/}1000={\displaystyle \frac{1}{200}}=0.005\text{ A } \\ R=U\mathrm{/}I=20\mathrm{/}0.005=4000\mathrm{\Omega } \end{gathered}$$

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