Electromotive concept - Solutions - Huaqiang Electronic Network

SMD Aluminum Electrolytic Capacitor

MOS Power IC Full Range

Probe Current Voltage Pin 420*4450, Head Diameter 5.0, Over Current and Voltage Pin

Brand AVX TPSE226M035R0125 - Low Impedance Tantalum Capacitor, AVX 22

Electronic Scale Crystal Oscillator 3.2x2.5mm 3225, 16MHz (16.000MHz), 12PF, 10PPM, 20PPM, 30PPM

Regarding the concept of electromotive force, it's important to understand a few key points: (1) Electromotive force (EMF) is a measure of a power source's ability to convert other forms of energy into electrical energy. A power source is a device that transforms energy from one form to another, such as chemical, mechanical, or thermal energy, into electricity. Every power supply has a positive and a negative terminal. Inside the power source, there is a non-electrical force that works against the electric field, moving positive charges from the negative terminal (low potential) to the positive terminal (high potential). This process converts other types of energy into electrical energy. The EMF is introduced to describe this capability. (2) The EMF of a power source is equal to the work done by the internal non-electrical force in moving a unit positive charge from the negative terminal to the positive terminal. Its unit is volts, just like voltage. The magnitude of EMF depends solely on the power source itself and is not affected by the external circuit. It is usually denoted as E for DC sources. (3) By convention, the direction of EMF is from the negative terminal (low potential) to the positive terminal (high potential), which is the direction of potential increase. This is the opposite of the actual direction of voltage. (4) Although EMF and voltage are different concepts, they both relate to the potential difference between the terminals of a power source. EMF refers to the work done by the non-electrical force to move a charge, while voltage is the work done by the electric field force. In a closed circuit, the effect of the power source can be represented by either EMF or voltage, depending on the context. However, their reference directions are opposite.