Current in the conductor

Calculate the current in the conductor (in mA) if it is connected to a 4.5 V voltage source and its resistance is 20 (ohm).

Correct result:

I =  225 mA

Solution:

$$\begin{gathered} U=4.5\text{ V } \\ R=20\text{ Ohm } \\ {I}_1=U\mathrm{/}R=4.5\mathrm{/}20={\displaystyle \frac{9}{40}}=0.225\text{ A } \\ I=1000\cdot I_1=1000\cdot 0.225=225\text{ mA} \end{gathered}$$

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