![]() We simply want to design a functional circuit, and consequently, we think in terms of how much power is lost (i.e., dissipated) or used (i.e., consumed). However, in most cases, we are not intending to transfer energy. We don’t say “transferred” because, in general, the final state or location of the energy is not important.įor example, if the voltage across a resistor is 5 V and the current through the resistor is 0.5 A, the resistor is transferring 2.5 W of power (as heat) to the surrounding environment. When we are analyzing circuits, we typically discuss power using the term “dissipated” or “consumed” instead of “transferred.” This emphasizes the fact that the power leaves the electrical system or is used by an electrical component. On the right side of the equation, the two “coulomb” terms cancel out, and we are left with joules per second. The unit is watts (W), where one watt is equal to the transfer of one joule (J) of energy in one second (s).Įlectric power in watts is equal to voltage in volts multiplied by current in amperes. Electrical power, then, is the rate at which electrical energy is transferred. ![]() In a scientific context, power refers to the rate at which energy is transferred. Power in Electronics and How its Calculated Voltages are the same across all components It is astonishing to think of the diverse and sophisticated functionality that begins with electrical energy that can be transferred through two small copper wires. ![]() If these two points are connected by a conductive material, electrons will naturally move from the lower voltage to the higher voltage this movement is called electric current, denoted by I.Įlectricity is a particularly convenient and versatile form of energy, and this has made it a powerful tool in the hands of the countless clever individuals who have designed everything from large electrical equipment to tiny electronic devices. When the accumulation of electrons creates a difference in electric potential energy between two points, we have a voltage (in equations, voltage is denoted by V). The various forms of energy-thermal, mechanical, chemical, etc.-are manifestations of a fundamental entity that results in physical change as it is transferred from one object to another.Įlectricity is a form of energy that results from the existence and movement of charged particles called electrons. This abundance of perpetual activity is bound to the concept of energy. Objects are moving, chemical reactions are taking place, temperatures are increasing and decreasing. ![]()
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