Alternating current

In the case of electric current, a distinction is usually made between direct current(DC ) and alternating current(AC ). Alternating current is characterised by changes in current strength and direction over time. In the European electricity grid, electricity is transported as alternating current and comes out of the socket in this form.
This means that the current - in contrast to direct current - changes its direction of flow regularly. The direction of flow is often depicted as a sinusoidal curve. How narrow or wide this is depends on the frequency, which is given in Hertz (Hz). In the European electricity grid, 50 Hz is used. Since solar cells produce direct current, an inverter is needed for conversion.