What is Electrical energy: Definition and 124 Discussions
Electrical energy is energy derived as a result of movement of electrons. When used loosely, electrical energy refers to energy that has been converted from electric potential energy. This energy is supplied by the combination of electric current and electric potential that is delivered by an electrical circuit (e.g., provided by an electric power utility). At the point that this electric potential energy has been converted to another type of energy, it ceases to be electric potential energy.
Thus, all electrical energy is potential energy before it is delivered to the end-use. Once converted from potential energy, electrical energy can always be called another type of energy (heat, light, motion, etc.).
Electrical energy is usually sold by the kilowatt hour (1 kW·h = 3.6 MJ) which is the product of the power in kilowatts multiplied by running time in hours. Electric utilities measure energy using an electricity meter, which keeps a running total of the electric energy delivered to a customer.
Let's imagine the year 2107.In that time electrical power will be generated in nuclear power plants and electrical energy will be produced in big nuclear reactors. Also the electrical energy will be transmitted by superconductor cables.
The electrical riddle no.5 is subjected to one of...
Let's imagine the year 2107.In that time electrical power will be generated in nuclear power plants and electrical energy will be produced in big nuclear reactors. Also the electrical energy will be transmitted by superconductor cables.
The electrical riddle no.5 is subjected to one of...
Let's imagine the year 2107.In that time electrical power will be generated in nuclear power plants and electrical energy will be produced in big nuclear reactors. Also the electrical energy will be transmitted by superconductor cables.
The electrical riddle no.5 is subjected to one of...
Hi all
I am totally new to this forum, so I do not know whether this has been posted before, and if so I appologize and hope that you can direct me to that thread.
I am currently involved in a project regarding energy storage and I have found out that the major technology platforms are the...
Okay, so I've been reading about energy and no source seems to make it clear what energy really is. I understand how energy relates to objects in the real world like with moving objects and heated objects, but other forms of energy are more confusing.
Firstly, what is electrical energy? I...
Ok I remember watching a video when I was twelve of this guy who used basically a refrigerator in reverse to create electrical energy from heat energy in outside air to power a house. Freon was run through black heat collecting panels, then through a compressor to make it hot. The heat energy...
Can someone please explain the difference between these three equations? I'm having trouble understanding their meanings and have no idea when I should use each one. Thanks.
P= I \Delta V
P= I^{2}R = \frac{\Delta V^{2}} {R}
I was watching an experiment that I don't understand. The professor turned a hand crank that generated electricity to light up a bulb. There was also a switch to turn the bulb on and off. When the bulb was on the crank became harder to turn. I don't really understand why that is. Did it...
Homework Statement
The cost of electricity varies widely throughout the United States; $0.120/kWh is a typical value. At this unit price, calculate the cost of (a) leaving a 40 W porch light on for 2 weeks while you are on vacation, (b) making a piece of dark toast in 3 min with a 970 W...
Homework Statement
How much does it cost to watch a complete 21-hour-long World Series on a 180-W television set? Assume that electricity costs $0.070/kWh
The Attempt at a Solution
\frac {0.070}{kWh} = \frac {x}{(180*10^{3}kW)(21h)}
\frac {0.070*(180*10^3 kW)(21h)}{kWh} = x
I...
Homework Statement
To repair a power supply for a stereo amplifier, an electronics technician needs a 100 micro-F capacitor capable of withstanding a potential difference of 90V between its plates. The only available supply is a box of five 100 micro-F capacitors, each having a maximum voltage...
Homework Statement
A hydroelectric dam holds back a lake of surface area 3.00×106 m^2 that has vertical sides below the water level. The water level in the lake is a height 130 m above the base of the dam. When the water passes through turbines at the base of the dam, its mechanical energy is...
What Kind Of Machine Converts Chemical Energy To Electrical Energy?
A)dynomite Explosion
B)batteries Or Fuel Cells
C)steam Turbine
D)hydrogen Bomb Explosion
E)tail Of A Firefly
Hi! I need to calculate electrical energy for a project, and I have no idea how to do it. I have looked everywhere on the internet and in my textbooks, but it's nowhere.
If possible, could you please tell me the formula and what the variables represent in it? That would be so amazing!
A piece of copper wire is formed into a single circular loop of radius 12 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.55 T in a time of 0.45 s. The wire has a resistance per unit length of 3.3*10^-2 ohms/m. What is the average electrical...
Hi, I have this topic for a science fair that involves converting sound energy to electrical energy.
Is there any simple way to do this? I tried googling, but ended up getting methods that I can't possibly do.
Any help is appreciated. Thx.
q. water flows over niagra falls which is 128m high at an average rate of 1.67e6 Kg/s. The acceleration due to gravity is 9.81. If half of the potential energy of this water were converted into electrical energy how much power will be produced by these falls.
Please help asap
MY work: PE/s...
An electron traveling at 2.5 \cdot 10^8 m/s of passes through a hole in a screen into a region where there is a uniform electric field strength 6.5 \cdot 10^4 N/C . If the velocity of the electron is in the same direction as that of the electric field, how far does the electron travel before...
An L-R-C series circuit with an inductance of 0.116 , a resistance of 235 , and a capacitance of 7.25 carries an rms current of 0.453 with a frequency of 393 .
The phase angle is .776radians.
The power factor is .714
The impedance is 329ohms
The rms voltage is 149V
The average power is...
If someone could help me start this problem, it would be greatly appreciated.
Charges of equal magnitude 1.00X10^-15 C and opposite sign are distributed over the inner and outer surfaces of the cell wall. Find the force on the potassium ion (K+) if the ion is, (a) 2.70 micro-meters from the...
Just wanted to see if anyone could check my work. I only have 1 opportunity to do this. Thanks yall!
1.) Suppose that you wish to fabricate a uniform wire out of 1.00g of copper. If the wire is to have a resistance of R=.5Ω and if all of the copper is to be used, what will be (a) the length...
2 problems. I was just wondering if someone can help me start off the problem. The rest, I'll try to do because I don't know how to setup the problem.
55) A virus rests on the bottom plate of oppositely charged parallel plates in the vacuum chamber of an electron microscope. The electric...
When Maxwell showed that light was an electromagnetic wave it was necessary to identify some oscillator of atomic proportions to account for these waves. Henri Lorentz , considered that electrons which are normally held in an equilibrium position are capable of vibration when displaced under...