Level 2
Level 2 requires school mathematics. Suitable for pupils.

# IllustrationResistor in series with a coil (RL circuit) - Switch-on process

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An electrical circuit consisting of a coil with inductance $$L$$ and an resistor $$R$$ connected in series to the coil. In addition, a voltage source which supplies the voltage $$U_0$$ as soon as the circuit is closed with a switch. Then a time dependent current $$I(t)$$ flows through the coil and the resistor. The current does not have its maximum value immediately, but increases slowly due to Lenz's law.
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