# All Questions

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52 questions
59 views

### Generate energy from waves that move my ship?

I'm currently building a small solar powered robot boat. I expect it to work fine (because why not.. :-) ), but I'm already looking for other ways than only solar panels to generate electrical power. ...
36 views

### Is there a limit for voltage a PM generator gets to based on RPMs?

I build different small PM handcrank generators for fun, Recently I built a single phase generator and printed myself a couple transmissions. Now as far as I know 3 things affect voltage, speed of ...
75 views

### How much power do power stations in parallel supply?

In modern power systems, the power is supplied by effectively connecting multiple generators in parallel. However, not all these generators are equal, some stations supply more power than others (I ...
23 views

### Hook up an automatic transfer switch with two phases only

We have a house in Haiti connected to the shore line. The shore line isn't always working so we bought a generator. I wanted to ground one of the two phases to create one neutral, one phase and a ...
112 views

### Power amp for function generator

I have designed a function generator with the XR2206. That works well. I can take it up to 2MHz (sacrificing on THD, however). Where I have failed so far, is the power stage. I have a supply of +...
93 views

### What does a 10MW wind turbine mean?

So if a wind turbine has a capacity of 10MW, what does that exactly mean? does it produce 10MW every hour, or is it the peak power it can generate at any time? the following question is how to know ...
340 views

### Two 3-phase generators in parallel

I need to calculate the PF of supply V2, a 3-phase generator that is operating in parallel with another generator (11kV star-connected). Both the generators are equally sharing the mechanical load of ...
197 views

### Variation of generator working frequency with load

I am confused with problem no 68. I have added my attempt. I am getting optionA but the book says it should be optionB. Please guide me where I am doing mistake.
811 views

### Varistor transient overvoltage protection of generator

Using a varistor is a common practice in alternator excitation system. It is used with rotating rectifier diode. Is it used for transient overvoltage protection?  Is it protecting diode or rotor ...
117 views

### Generated current in a $3\times450$ VAC $60$ Hz $1150$ kVA generator

Let's say I've a $3\times450$ VAC $60$ Hz $1150$ kVA generator. How much current will there be generated when it runs at maximum capacity? MY WORK: The total Active power over a three-fase ...
146 views

### I have a generator that can produce 150 watts, i have a dc motor that takes in 100watts, why is it that my generator wont run the motor? [closed]

I am trying to simplify this as much as possible as there are tons of variables that people could point out, but i made a small generator which then I rectify to produce DC straight out of the coils, ...
527 views

### Measuring the power output of a hand-crank generator

I am working on a project which aims to compare the energy generated from a hand-crank, DC generator, to that of solar panels. The hand crank generator will not actually be powering anything, but we ...
393 views

### how to know the voltage i can generate from a 240V AC motor

I have an AC motor from a toilet fan, and i want to use it as an air turbine to generate electricity. all i know about the fan/motor is the following: Input Voltage:220-240V AC Input Wattage: 15W ...
78 views

### Wind Turbine - Current vs Power trend

I'm looking at wind turbine current - power trends, and there is a phenomenon I need help to explain! The data I'm analysing is from a 3-phase generator. Below is a scatter plot of current (x axis) ...
88 views

### Why would venting an engine create a negative amperage on a generator?

I'm writing simulation software for a civilian helicopter. The helicopter has two engines and two generators. Normally, we calculate the amperage reading of a generator through Ohms. I = W / V. ...
111 views

### How to use the electricity from a generator in an efficient way

I'm looking to buy a generator for producing electricity to power different things (e.g. a fridge), in a place where there's no electricity. For now, I do not have a fridge but I may have one in the ...
668 views

### Voltage regulation in alternator

A single phase, 2000 V alternator has armature resistance and reactance of 0.8 Ω and 4 Ω respectively. The voltage regulation of alternator at 100 A load at 0.8 leading power factor is _______? ...
5k views

### Power generator droop characterstics

I'm really confused in solving the following question. An isolated 50 Hz synchronous generator is rated at 15 MW which is also the maximum continuous power limit of its prime mover. It is ...
488 views

### Can you turn Diesel/Petrol/Gasoline into electricity without an explosion? [closed]

Perhaps the title is a little click-baity, but having recently purchased a generator to power off-grid devices 24/7 (solar was a no-go due to its price/performance), I thought it was surprising that ...
166 views

### Motor connected to generator

I've recently made a test in our laboratory at the University. We have a 3 phase synchronous generator connected to a synchronous motor. The generator has its exciter coil connected to an external ...
632 views

### Super capacitor vs. battery

I've made a turn signal system for my bicycle that uses power generated from the wheel. The wheel puts out 0-9v and is irregular depending on the speed. My lights take 3v, originally from two 1.5v ...
221 views

### Hydropower formula:

If I had a 10 kW hydro electric generator (including turbine drive), what formula would I use to calculate how much water per second would need to be pumped into the turbine at 700 kpa to generate the ...
61k views

### What kind of generator do i need to run a 1.5 or 2 ton Air Conditioner? [closed]

I am planning to purchase a single AC that would operate on my Diesel generator. My Generator is a 5kVA , 8 HP air cooled one. I want to know that If I have to run only one AC on the generator shall I ...
280 views

### A question about reactive power

I have two questions about reactive power. 1) I have read that the flow of reactive power is proportional to the magnitude of voltage difference between nodes. Could someone explain me this? 2) At the ...
6k views

### How to calculate power of a generator

I have been searching online on how to calculate power of a generator based on the rpm, but I cannot find anything. Is there a equation that relates rpm and power generated by a induction generator? ...
1k views

### What is capacitance required for this 3 phase rectifier

In the diagram above I want to know the value and the rating of the capacitor that should be used for good rectification The Line to Line voltage is 400 , and by relation Vdc =(3√2 VL)/pi=(3√2 x ...
369 views

### Auto load limiter reverse power problem

Our generator is connected to grid by 33kv line. Due to some reason we supply a fixed amount of power to grid. This is done by a device named Auto Load Limiter Device which looks like It measures ...
326 views

### Phase Sequencer

I have 3 phase voltages entering into my PIC ADC (3 different channels ) through a voltage down scaling circuit and I have successfully calculated their rms values inside my controller.Know I want to ...
9k views

### trying to increase current output of a generator

this is my first time posting here also I'm very new to electrical engineering. i am building a pull cord (like a lawn mower) human powered generator and I'm looking for ways to increase the current ...
4k views

### Line Voltage of a three-phase star-connected generator

"If the phase voltage of a three three-phase star-connected generator is 200 V, what will be the line voltages: a) when the phases are correctly connected b) when the connections to one of the ...
2k views

### resistive braking for induction motor?

It occurred to me that since single-phase AC induction motors can act as generators, it might be possible to brake an induction motor with a resistive load. The basic idea is that when you want to ...
2k views

### how to compute the average power from AC generator

I would like to monitor the power produced by an AC generator in a wind turbine. The goal is to monitor how the produced power varies with wind conditions. I connected the power resistor to AC ...
64 views

### How to pick a rechargeable battery?

I need a rechargeable battery that can produce about 10 Wh per day. In a day this battery/ies should produce 281 mA for about 15 s, 265 mA for about 30 min, and about 131 mA for the rest of the day. ...
666 views

### Generating electricity by moving door handle to produce 3 Watts?

I want to attach a generator to a door handle and have the output charge a battery. My system needs to provide about 3 Watts. A similar question was asked here and I referenced it to get an idea of ...
611 views

### Why does the volatge drop is huge once a load is connected to a generator?

At no load condition the generated voltage at transformer secondary output is 140 V ac. When a 60W resistive load is connected the voltage drops to 27 V ac. The pmg generator rating is 1 KW 415 V and ...
518 views

### Bottle dynamo (bike generator) rectification and stabilization circuit for LED light

A friend of mine would like to convert her bottle dynamo (bike generator) to run a LED light. The light needs to stay on for maybe 90 secs when the bike is stopped, and needs to blink (using a ...
156 views

### Why Does My PMG Generator gets Locked Up?

I tired to connect a 60 W 240 V resistive load to a 1000 W generator which was running at 200 V immediately after the load was connected the voltage drops to 60 V and the generator stops spinning. By ...
3k views

### How to correctly edit a system to increase per-unit voltage of a bus [PowerWorld Simulator]

I have created and simulated the following energy system using PowerWorld Simulator 17 (please download the picture if it's not clear). Now, I was given the requirement that every bus should have per-...
226 views

### Help building electric generator?

I am in the process of building an electric generator for the first time, and I have found out most of what I need to do, except the following things. Can I have 2 rows of magnets linked together ...
2k views

### How does one estimate the electrical power of a power plant?

I've asked several people how a power plant creates power (i.e. currents and voltages) and I found that they were unsure. In addition, I’ve done several searches to get more information, and I was not ...
297 views

I am really stuck on this and I couldn't find any references on the internet regarding this. When a load is connected to a generator, why does the current withdrawn from the generator increases. Since ...
9k views

### Creating power from shaft rotation

I am a mechanical engineer and am working on a project. This project consists of a rotating shaft and I would like to generate power from that rotating shaft.The shaft will not be rotating ...
2k views

### Improving an existing half wave rectifier circuit on generator

Background: Just upgraded my old Generac portable generator by replacing the rectifier which had gone bad. Here is the schematic. The old style rectifier that this unit used is no longer made or ...
128 views

### Where are the losses in an inverter-type portable generator?

I have an inverter-type portable gasoline generator that is rated at 3kW / 3.3kW surge. In the service manual, the engine's power output is said to be 4kW. (The engine's displacement is 269cc). I am ...
3k views

### The electricity grid: what keeps small power generators from being 'driven' by large ones?

This is a two part question and pertains to power generation: What prevents a larger plant (say nuclear) from turning an itsy-bitsy gas generator into an electric motor and drive current through it? ...
2k views

### How do I modify a DC electric generator to get the same power at a lower speed?

This will be a theoretical question. Suppose that I have a DC generator, and I'm getting 300VA power from it when it rotates at 2000rpm. I want to make it run at a lower speed of about 700rpm, and I ...
2k views

### 3 phase vs 1 phase alternator

I have an automotive alternator, and would like to rewind it for higher voltage for wind power application. Since I am going to use it for Battery Charging, should rewinding it for single phase ...
4k views

### Can I pedal power a laptop device while the device is being used?

I want to research how easy it would be to use a small laptop device while powering it by pedaling on a stationary frame. (For example, using a tablet on an exercise bike, or using a netbook while ...