Power Definition and 998 Threads

Midland Nuclear Power Plant was going to have two nuclear reactors from Babcock & Wilcox. Unit 1 was to have a capacity of 460 MWe, while Unit 2 was to have a capacity of 808 MWe. Were the reactors twins that simply had different steam machinery due to the cogeneration requirements or were they...

Homework Statement 1. A sinusoidal source with RMS voltage V = 11Volts across a resistor R = 50Ohms, determine the dBm value. Hint: you will first have to determine the power delivered and then check the formula for dBm calculations. 2. A type of coaxial cable has a loss of 12dB/100m at some...

Homework Statement Is there a power factor convention when it comes to the angles of a given current and voltage? In one class I learned that PF = cos(θ_V - θ_I) but in another the professor claims (I still think he is wrong) the convention for that class is PF=cos(θ_I - θ_V). Here is a...

Let's assume you have a perfectly insulated closed liquid loop with a pump who's motor is cooled by the liquid its pumping. Assume steady state operation, so the pump is operating at some pressure difference and flow rate based on intersection of pump curve and back pressure curve. Does this...

Thank you in advance - as they say - to ANYONE who can help me figure out how/whether a small solar solution could help my brother in Puerto Rico. Still no water/power. Just candles and a garden hose with "water". I have info overload from DIY sites. Can an average person set something up for...

Homework Statement Two 110-V light bulbs, one "25W" and the other "100W" are connected in series to a 110 V source. Then: a. the current in the 100W bulb is greater than in the 25W bulb b. the 25W bulb will be brighter c. the current in the 100W bulb is greater than that in the 25W bulb d. the...

Homework Statement Homework Equations P=F*V, dU=Q-W?, W=m(h1-h2) The Attempt at a Solution I have the initial conditions and final conditions written out. For W=m(h1-h2), I have W=9.48(h1-h2). I am having problems with the h values, which can be found in the steam tables.

Homework Statement The power required by a helicopter when hovering depends only upon the vertical thrust (a force) F provided by the blades, their length l, and the mass density of air, ρ. Establish an equation that relates the helicopters power requirement to these three quantities. By what...

Hi, I was trying to learn fault analysis in three phase system from conceptual point of view. I need your help to clarify few seemingly contradictory points in the following video: 1: At 32: 42, phase to ground fault in introduced. It is said that line voltage Vbc is not affected as is also...

I'm working on modeling a basic mechanical power system for a video game project. The transfer system consists of meshing gears, belts, and axles/shafts which can have basic clutches that engage/disengage. There are also power producers (hand crank, windmills, water wheels, turbines) and...

I have 52 laser diodes, rated 5VDC, 5mW, wired in parallel and powered by a battery, rated 5V, 2A (I measure 2.7). I'm thinking some diodes burn out because as the voltage drops, the current becomes too great. The diodes manufacturer states the maximum operating current of each diode is 20mA. I...

Homework Statement A fire hose for use in urban areas must be able to shoot a stream of water to a maximum height of 34 m. The water leaves the hose at ground level in a circular stream 4.0 cm in diameter. What minimum power is required to create such a stream of water? Every cubic meter of...

Homework Statement I am asked in a lab report to explain the conservation of power in the armature circuit of the DC motor. Homework Equations This is the data I have acquired: The Attempt at a Solution I have been reading around, and I have learned somewhat about the Armature Copper Loss...

Homework Statement The current source and voltage source in the circuit shown in the Figure below are connected in parallel so that they both have the same voltage, vs. The current source and voltage source are also connected in series so that they both have the same current, is. Suppose that...

I'm reading about solar wind and the effects it has on Earth. The charged particles from the solar wind have the potential to affect power grids which can cause outages. I know that it is related to electromagnetism, but how exactly does this happen?

Hey folks, I built a generator for fun and I would like to find out how much power it is producing when I use it. I have a way of measuring mechanical power in but I am not quite sure on how to measure electrical power out. I'm thinking I could use some LEDs to create a load (or maybe...

Did the Chernobyl Disaster have any major effects on the Soviet power grid as a direct result of the accident or due the retrofit and cancellation of RBMK reactors?

I have a small power washer with a two-wire cord and GFCI plug. My outdoor and garage receptacles are on a "house GFCI" circuit, wired in series to one GFCI receptalce. Yesterday I tried to use the power washer and the plug GFCI would instantly trip when plugged-in and instantly re-trip when...

Hi all I am searching some commercially available industrial grade power amplifiers: 1.In the frequency range of 80 KHz to 140 KHz with output power of 2 KW to 50 ohm load in pulsed mode (<10% Duty Cycle 2.In the frequency range of 400 KHz to 450 KHz with output power of 5 KW to 25 ohm load...

Let's say an entire city runs on a network run by quantum computing. Fail safe locks are run by this network. Would triggering a massive unlocking of the city be a simple matter of killing the main power to shut down the quantum network (by shutting down the cooling systems)? It seems logical...

Homework Statement Hello everyone, I'm working on a (simplified) Mars energy model in which I need to calculate the area of land I need to cover in solar panels in order to achieve an particular power output. Say the land I'm looking at receives a constant solar irradiance of 100W/m^2 from...

"Google's Pixel Buds translation will change the world" "Google's Pixel 2 event in San Francisco on Wednesday had a lot of stuff to show off and most of it was more of the same: the next iteration of the flagship smartphone, new Home speakers and various ways of entwining them more deeply into...

Steam Power Plant Questions

Homework Statement Design, giving the necessary ratings and characteristics necessary for the transformer, bridge rectifier, reservoir capacitor and regulator, a 12 V, 2 A regulated power supply. Also identify any heat sink requirements. The available mains supply is 230 V ±10% @ 50 Hz...

I gather rocket energy efficiency is maximal when exhaust speed closely matches the rocket speed (but oppositely directed), so to an outside observer such a rocket would leave a stationary propellant trail. I’ve found little on this model and am trying to learn more. Say we have a rocket of...

Homework Statement I am given this circuit: One of the questions is to find the total power factor of this installation. The other questions involving current and such, I have solved. Homework EquationsThe Attempt at a Solution I am able to find the power of each Z1 and Z2, by multiplying...

Hi, I am just clueless about this. I turned my computer off with the battery at 100% ( I was using power cord with outlet). I disconnected from the server at the coffee shop, went to " Shut Down" on Windows icon menu, turned machne off. This morning I turn my PC on and the battery is at around...

Homework Statement One type of tuning circuit used in radio receivers is a series LCR circuit. You like listening to a station1 that transmits 99.3 MHz in . The government wants to make 100.1 MHz available to station2. Assume that the transmitters of the two stations are equally powerful and...

Hi. As far as I know, the main reason for using AC in electric power transmission is that voltage can easily be transformed. If there was a similarly easy way for transforming DC, would power grids work basically the same? To be more specific, how much does AC power transmission rely on the...

Hello, I read in my physiology book that when the ciliary muscle relaxes, the power of the eye lens decreases, hence we get the ability to see far objects. I am new to physiology, and when I googled "the power of the eye lens" I didn't find articles explain the sentence above simply. So I...

Homework Statement Say you connect Circuit A with low output impedance to circuit B with high input impedance. Why does this cause minimal voltage drop compared to connecting them the other way around (high output to low input). Homework Equations P = V^2/R P = IV The Attempt at a Solution I...

Hey! :o I am looking at the proof of the following proposition: Let $\displaystyle{\phi, \ldots , \phi_k\in V^{\star}}$ and $\displaystyle{\psi_i=\sum_{j=1}^ka_{ij}\phi_j, \ i=1, \ldots , k}$ with a matrix $\displaystyle{(a_{ij})\in M(k\times k, \mathbb{R})}$. Then it holds that...

First off I'm not an engineer nor do I have a electronics background. I have an old Linear (HP 6284A Power Supply). I would like to be able to display Hz/CPS. I need to measure the speed of a tattoo machine. (basically two coils that make and break connection through out its use. From what...

Lets say I have an LED that is being pulsed once every two seconds. The LED uses 5 mA of current each time its fired and the pulse lasts for 40mS. I know the current into the LED because I measured the voltage drop across the dropping resistor of 420 ohms with a good O-Scope. So I know all...

Homework Statement Today I did a laboratory work in which I had to find power and internal resistance. I used an ordinary battery so it's closed circuit. I did all tasks except writing a hypothesis and conclusion I can't really think of it. I don't know what to write since I just measure using...

I wonder what is the best figures for blades/prepellers - assuming I am trying to optimize battery life and my main usage for the drone is hoovering. I can not play with the arm length. I do consider 4 blades over 2 blades at the same propeller - not sure if it will help. Any feedback or idea is...

Homework Statement Homework Equations Power Triangle and 3-phase equations (listed in my solutions) The Attempt at a Solution Here are the instructor solutions: The instructor solutions just go straight into using equations, but I like to use the power triangle because it is more...

Is it ok to assume that the entropy ##S## of an arbritary system can be written as a power series as a function of the system's internal energy ##U##? Like $$S(U) = \sum_{i=1}^{\infty}a_iU^i = a_1 U + a_2 U^2 + \ ...$$ with ##a_i \in \mathbb{R}##. What results could be obtained from such...

Hi, I have 6 cables. Each cable has 3 wires: zero, phase, earth. Each cable supplies 320W 230VAC heater (I have 6 heaters). I am looking for 1 multi pin connector for all these cables for quick plug in/out. Link to example connectors...

Homework Statement In an AC circuit of periodic current we know: ##E=6[V]##, ##R_g=50[Ω]##, ##L_g=\sqrt3 [nH]## and ##ω=50*10^9[s^{-1}]##. Calculate: a) All available power of the ##E## b) The resistance of ##R## so that the average power is max c) That average power from part b) Homework...

Hi For a 1200 watt tool, there are 20, 40 and 60 volt batteries, and in the case of a 2 amp hour (7200 Coulomb) battery, using energy = charge x voltage gives different values of stored energy for each of the three batteries, which are 144000, 288000 and 432000 Joules. Is this correct? Thanks

I'd like to know if there's a power transfer loss depending on how gears are connected and placed relative to each other. For the two distinct image down below, imagine ALL GEARS HAVE EXACTLY THE SAME DIAMETERS and the setup is such that the viewers are seeing the top (aerial view) and the gears...

A radar antenna transmits 50kW at 10 GHz. Assume transmission is in a narrow beam, 1m^2 in area, and that within the beam, waves are plane waves. The wave is reflected from an aircraft but only 1% of the power propagates i the direction of the antenna. If the airplane is at a distance of 100km...

Has anyone got a good link to a guide to UK power lines? I hate looking up and not knowing what's there. For example, my house has several poles leading to it, strung with one live 240V and one neutral, the latter being tapped to Earth at each pole. What if there are two lines, strung...

I am looking at electric motor performance data for a vehicle motor with a torque limited output that is unknown. The performance of the motor is shown below. The vehicle weighs 2150kg. Is there a way to estimate the torque from the power over time? I know how to calculate torque at any given...

Lavolta BPS 305 0-30V and 0-5A. I was showing a young lad how you can energise a car ignition coil and get a spark on the output, and that this effect can be improved by adding a cap in parallel which forms a crude LC oscillator etc when the unit died. Silly, I know, but we got a bit carried...

Find the full text here Staff Report to the Secretary on Electricity Markets and Reliability I really like this report, it's right up my alley. It is professionally done. Every assertion of fact is documented with citations to reputable data sources. I found nothing outrageous in the 187...

Can ##sqrt(-i)## be expressed as a complex number z = x + iy with unitary power?

Where is my simplification wrong?

Hello, Is it possible for a car alternator to work like a battery and power a motor?