Briefly explain energy and power, Electrical Engineering

Assignment Help:

Q. Briefly Explain Energy and Power?

If a charge dq gives up energy dw when going from point a to point b, then the voltage across those points is defined as

v = dw/dq

If dw/dq is positive, point a is at the higher potential. The voltage between two points is the work per unit positive charge required to move that charge between the two points. If dw and dq have the same sign, then energy is delivered by a positive charge going from a to b (or a negative charge going the other way). Conversely, charged particles gain energy inside a source where dw and dq have opposite polarities.

The load and source conventions are shown in Figure, in which point a is at a higher potential than point b. The load receives or absorbs energy because a positive charge goes in the direction of the current arrow from higher to lower potential. The source has a capacity to supply energy. The voltage source is sometimes known as an electromotive force,or emf, to convey the notation that it is a force that drives the current through the circuit.

67_Briefly explain energy and power.png


Related Discussions:- Briefly explain energy and power

Describe the physical properties and uses of the brasses, Describe the phys...

Describe the physical properties and uses of the Brasses. Brass - It is an alloy of copper and zinc along with 60 percent copper and 40 percent zinc. Its properties are- 1.

Explain loads - generation and absorption of reactive power, Explain Loads ...

Explain Loads - Generation and Absorption of Reactive Power A load at 0.95 power factor implies a reactive power demand of 0.33 kVAr per kW of power. When planning a network, i

Determine the synchronous speed in revolutions per minute, Q. Determine the...

Q. Determine the synchronous speed in revolutions per minute and the useful torque in newton- meters of a 200-hp, 60-Hz, six-pole synchronous motor operating at its rated full load

What do you mean by signal multipath, Q. What do you mean by Signal multipa...

Q. What do you mean by Signal multipath? Signal multipath occurs with electromagnetic wave propagation via sky wave in the HF range. When the transmitted signal reaches the rec

Solving electrical circuits, i need help solving an electrical circuit, usi...

i need help solving an electrical circuit, using kirchoffs laws, it a diamond shape with one voltage source

Coupling, different coupling methods

different coupling methods

What is the function of dma address register, What is the function of DMA a...

What is the function of DMA address register? Every DMA channel has one DMA address register. The function of this register is to keep the address of the starting memory locati

Mechanical structure of depletion type mosfet, Mechanical Structure of Depl...

Mechanical Structure of Depletion Type MOSFET The mechanical structure of this type of device is displayed in figure. In an IC, we would locate two n-type regions side by side

3 phase meter, What is reading mechanism of a 3 phase meter?

What is reading mechanism of a 3 phase meter?

Multiple tariff meters or tou meters, Multiple Tariff Meters or TOU Meters ...

Multiple Tariff Meters or TOU Meters Time of use metering facilitates load control and planning on the part of utilities. This is efficiently achieved using a concept known as

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd