Power Vs Current

Power is the rate at which work is done.

Power vs current. As mentioned appliances such as electric power showers large cookers electric car chargers etc will all draw larger amounts of current so will generally require a larger size cable to supply the required current and prevent too much current being drawn which can cause overheating and the potential for the cable to catch fire. It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power. This phantom power is called reactive power and it is measured in a unit called volt amps reactive var rather than watts. Ampacity is the current carrying capability of a wire.

The mathematical symbol for reactive. It is also used to power large motors and other heavy loads. Current is the rate at which charge is flowing. Voltage is the electrical force that would drive an electric current between two points.

Resistance is a material s tendency to. Unlike ac a direct current undergoes no switching. The movement of electrons. The following chart is a guideline of ampacity or copper wire current carrying capacity following the handbook of electronic tables and formulas for american wire gauge.

As already mentioned dc is prone to lose power as heat a characteristic that edison exploited to light the first bulb. Power and alternating current ac 7 10 00 sections 18 5 18 8 electric power. Three phase electric power is a common method of alternating current electric power generation transmission and distribution. Contents 1 relationship between voltage and current 2 circuit 3 symb.

Current is the rate at which electric charge flows past a point in a circuit. We know that reactive loads such as inductors and capacitors dissipate zero power yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power. Voltage is the difference in charge between two points. They all operate using the same basic power source.

The power supplied to a circuit by a battery is calculated using p vi. 1 w 1 j s electric power is given by the equations. A three wire three phase circuit is usually more economical than an equivalent two wire. In other words how many amps can it transmit.

The three basic principles for this tutorial can be explained using electrons or more specifically the charge they create.