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Power cord plug knowledge
- Jun 29, 2018 -

                                          Common sense term for power cord plug


I. definition of power: power refers to the work done by an object in a unit time, that is, the power is the physical quantity that represents the speed of work. The formula for calculating power is

P=W/t P means power, the unit is "Watts", "tile" for short, and the symbol is "W".

W means work, the unit is "Joule", "coke" for short, and symbol is "J".

T means time, the unit is "seconds", and the symbol is "s".

P = UI = U2 / R

Two. Definition of voltage: electrostatics states that the potential difference between two points is called voltage. Electrotechnics calls the cause of electric current in a conductor called voltage.

Voltage, like water pressure, the water pressure can make the rest of the water flow in a certain direction, then the voltage is a physical quantity that can make the electrons in a conductor move in a certain direction.


Three. Definition of current: current refers to the directional movement of charge. The size of the current is called the current intensity (the current, the symbol is I). It refers to the amount of charge in a section of the wire in a unit time, and is called a "A" by a Coulomb of electricity per second.

The commonly used units are mA and micro A (MU).

The conversion is as follows:

1A=1000mA, 1mA=1000 mu A


Four. Definition of resistance: the magnitude of the current flow blocking force. The unit of resistance is Ohm, which is expressed by the symbol "Omega".


Ohm's definition: when a voltage of 1 volts is added at both ends of a resistor, if 1 amperes are passed in the resistor, the resistor is 1 ohm.

In the international system of units, the unit of resistance is omega (Ohm), in addition, there are K ohm (Euclidean), M ohm (MEGA). Among them: unit conversion

1M Omega =1000K Omega, 1K Omega =1000 Omega


Five Ohm's Law: the relation between voltage, current and resistance.

Ohm's Law: R=U/I

Voltage = resistance * current

Current = voltage / resistance

Resistance = voltage / current