Siemens DTU3005-B Especificaciones descargar pdf (Pagina 27)

Power and Power Factor

Load Types Distribution systems are typically made up of a combination of

various resistive, inductive, and capacitive loads.

Resistive Loads Resistive loads include devices such as heating elements and

incandescent lighting. In a purely resistive circuit, current and

voltage rise and fall at the same time. They are said to be “in

phase.”

True Power All the power drawn by a resistive circuit is converted to useful

work. This is also known as true power in a resistive circuit. True

power is measured in watts (W), kilowatts (kW), or megawatts

(MW). In a DC circuit or in a purely resistive AC circuit, true

power can easily be determined by measuring voltage and

current. True power in a resistive circuit is equal to system

voltage (E) times current (I).

In the following example, an incandescent light (resistive load)

is connected to 120 VAC. The current meter shows the light is

drawing 0.833 amps. In this circuit 100 watts of work is done

(120 VAC x 0.833 amps).

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 87 88

Sin comentarios

Siemens DTU3005-B Especificaciones Pagina 27