Tasajännitteenä

Tasajännitteenä refers to direct current voltage. In a direct current (DC) circuit, the electric charge flows in one direction only. This is in contrast to alternating current (AC) where the direction of flow reverses periodically. The voltage in a DC circuit, therefore, has a constant polarity, meaning one terminal is always positive and the other is always negative. This is why batteries and solar cells produce direct current. Common examples of devices that operate on DC voltage include most electronic devices like smartphones, laptops, and LED lights, which are often powered by batteries or converted from AC mains power using a rectifier. The strength of the voltage, measured in volts, remains steady over time, unlike AC voltage which fluctuates. Understanding the difference between AC and DC is fundamental in electrical engineering and for safely working with electrical systems.