We can calculate the resistance of the radio circuit by using Ohm's law:
[tex]V=IR[/tex]
where
V is the voltage of the circuit
I is the current
R is the resistance
In this circuit, [tex]V=3.0 V[/tex] and [tex]I=2.1 \cdot 10^{-4} A[/tex]. If we rearrange the previous equation and we use these data, we can calculate the resistance of the circuit:
[tex]R= \frac{V}{I}= \frac{3.0 V}{2.1 \cdot 10^{-4}A}=1.43 \cdot 10^4 \Omega = 14.3 k\Omega [/tex]
