Voltajallikas

Voltajallikas is a Finnish term that translates to "voltage source" in English. It refers to any device or component that provides a constant or nearly constant electrical potential difference (voltage) across its terminals, regardless of the current drawn by the load. Ideal voltage sources maintain a fixed voltage value. In reality, all voltage sources exhibit some internal resistance, which causes the output voltage to decrease slightly as the current demand increases.

There are various types of voltage sources. Batteries are common electrochemical voltage sources that store chemical energy and convert it into electrical energy. Power supplies, often used in electronic devices, convert alternating current (AC) from the mains into direct current (DC) at a specific voltage. Generators, on the other hand, convert mechanical energy into electrical energy, producing a voltage. Solar cells are photovoltaic devices that convert light energy into electrical voltage. The fundamental function of any voltage source is to drive electric current through a circuit by establishing an electric potential difference. The output voltage is a key parameter characterizing a voltage source.