# Electronics

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Active vs Reactive Power
In alternating current (AC) circuits, the transmission of electrical energy and the behaviour of electric machines is often easier to understand by working with power rather than dealing with voltages and currents. Power can be defined in various ways, the applicability of the definition depending on the type of circuit.
What is a DC-DC converter ?
A DC-DC converter is an electrical system (device) which converts direct current (DC) sources from one voltage level to another. In other words, a DC-DC converter takes as input a DC input voltage and outputs a different DC voltage. The output DC voltage can be higher or lower than the DC input voltage. As the name implies, a DC-DC converter only works with direct current (DC) sources and not with alternative current (AC) sources.
What is a low pass filter used for ?
In this article we’ll give a brief introduction into what a low pass filter is, why we need it and how it works
Logical operations and boolean functions
Logical operations and boolean functions
RL circuit – detailed mathematical analysis
RL circuit – detailed mathematical analysis
Kirchhoff’s Current and Voltage Laws (KCL and KVL)
Kirchhoff’s Current and Voltage Law (KCL and KVL) with Xcos example