Amps Definition and 104 Threads

Hello, I have a limited knowledge of electronic engineering, so please bear with me. I want to Have a device that I could have high volts with low amps and have the power be sustained. Then I could possibly use an Arduino with a silicon carbide MOSFET to do precise pause with modulation. The...

I am asking this question in behalf of my father ( who does not have an account here to ask this question himself). My father said he does not understand why a simple light bulb in an AC circuit does not draw far more amps than a simple light bulb draws. He thinks that a typical light bulb...

I'm just curious, I have looked for application notes and such but don't see a simple answer to this question. Given the band gap of semiconductors that are very obvious in devices like diodes and transistors and such, how do designers achieve 'rail-to-rail' performance in an op amp, and get...

In my city (USA) typical older houses have "100 Amp service" so their peak electric usage is limited to 100 Amps. In considering what sort of electric air conditioning system to install in such a house, peak usage is major consideration. Generally speaking, which type of residential unit...

I used to work in HVAC. There are three main types of alternating current (AC) motors in residential air-conditioners and heat pumps: outdoor fan motors, compressors, and indoor blower motors. All three types of AC motors have the maximum number of amps stated on the nameplates of the units...

Here's the circuit in question: Solution: Now, when I try simulating in LTSpice, this is what I get: So, Vout appears to be around -13 V, which doesn't agree with the equation if V1=V2= 5 is plugged in. Does anyone see the mistake here? THanks.

When an alternating current motor first turns on, what causes an alternating current motor to pull locked rotor amps for approximately one second after first turning on as opposed to just pulling the same amount of amps the entire time? What causes the amperage on an AC motor to drop after...

Hi I live in the Santa Clara bay area in the Silicon Valley, I want to see anyone here that are living close by that are into high end audiophile stuffs particular designing and building audio electronics. It's hard to find anyone that is into this, it would be nice to find people to share this...

So I've basically built a robot that has a lot of servo motors. 14 of them can draw up to 3 amps each(max)(usually 1 amp average) at 4.8 to 7 volts. What's my best option to power it? The power source doesn't need to be connected to the robot, so weight shouldn't be an issue. My best guess is...

I made a chart and this is my attempt. I am not sure that I am doing the calculations right thou

When an electric motor first starts running, the motor will draw approximately 5X the normal amp draw of the motor for approximately the first half second that the motor runs. The amps that an electric motor draws for about half a second that are about 5X the normal amp draw of the motor are...

Hello! today I have a question regarding the most efficient way to generate electricity by moving a magnet across a coil. The theoretical magnet would be moving in a circular motion fixed to the outer circumference of a driver wheel like in many simple generators, how does the physical torque...

Is there a formula that I can use to calculate the HP a motor is actually making if all I have is amp draw? I am trying to size a gearbox, but the customer has no idea what torque is needed. All they know is the motor is drawing 5 amps when it spikes and 3.5 amps when it is running. I am...

Lightbulbs are rated in watts. Watts = energy/time = volts*current Does it matter if you have a very low voltage source with a very high current or a very high voltage with a very low current? If the voltage and current multiplied meets the power rating, what should it matter what proportion...

Hello. I'm looking for a quad op amp similar to TL074 but rail to rail (mainly for input) in DIP14 (I found a lot in SMD) and supporting +12V / -12V as power supply.

Is there a way to determine how many amps / watts is required from an electric motor in order to move (lift, push or pull) an object weighing a specific amount? Conversely, is there a way to determine the maximum amount of weight an electric motor can move (lift, push or pull) based on its...

I have a project that involves a small motor, and the battery powering it would blow the motor in an instant without proper use of resistors. The battery I'm using is rated at 9.6 volts and 1600ma. The motor however, is rated at 3 volts and 0.3 Amps. I would like to go just under these ratings...

If volts is only an "electro motive force", that is, it only pushes, and resistance is what tries to hold everything back, and "amperage", that is, current, is the actual electricity ( or not, that is my question ) and watts is the calculation of everything together and the total output, is it...

Hey guys! So I'm trying to do this pretty wide diameter in-runner engine, where the rotor is hollow (essentially trying to make a short tube within a short tube :D). After checking out the details between the different types of electric motors (and realizing that I can barely find any...

Batteries are connected in parallel. Multimeter shows: 1,5V AND... "0.12A" regardless of battery number. Volts stay the same but should not Amps add up in parallel? "0.12A" with 4, 5 or 6 batteries... Details: Amps measured correctly by closing the circuit with multimeter probes (bulb lights...

Hello, I was reading a previous thread that is now closed. What I'm curious about is a simple wiring schematic. I want to charge a battery on my trailer while it's hooked to the truck from the trailer 7 pin rv connection. The rv connection has a 12v hot all the time wire that I could use to...

Greetings, I'd like to invert a signal I get from a photodetector (the signals are up to 100 mV). I decided to use an inverting op amp circuit for that, however, when looking online through the op amp catalogs - the minimum input voltage in the descriptions is a few volts while my input would...

The wire on the charger that came with my laptop eventually frayed, and I had to buy a new charger for my laptop. Both the new and old chargers for my laptop plug into a standard wall outlet. On the new charger, it says the following: " Input: 100-240V ~ 1.5A 50-60Hz Output: 19V --3.42A 65W...

Does that mean that the electrons are moving faster or what ?

The question: Calculate the energy used by the lamp in 6 hours of use. The answer: P=V.I.t P= 240v X 0.2A X 6hrs X 3600s P= 1036800W!? I thought energy was Joules? Why has the answer been given in watts? Please help!

<< Mentor Note -- Please read to the end of this thread -- important information about AC Mains connected projects is discussed >> Hello everyone, I am an electrical engineering student (though in the very beginner stage of it), and I could really use some help with understanding inputs and...

Homework Statement A student investigates the efficiency of a small electric motor. He uses a motor to lift it a mass through a constant distance of 1 m. He times how long it takes to lift the masses and makes a record of the potential difference and the current of the motor. In the book that...

Homework Statement https://physicsforums-bernhardtmediall.netdna-ssl.com/data/attachments/73/73750-4bf3d2aa03a724fcf0b13a6b1111902f.jpg The Attempt at a Solution V+ > V- for Vout to be +16V V+ < V- for Vout to be -16V V+ = -8x(in) V- = (-15x18)/30 + (15x12)/30 = -3 My attempt on it was that...

Let's say you have a basic series circuit with a battery power source that has 12 volts. You also have a load of some sort with 3 ohms of resistance. Therefore you'll have 4 amps of current throughout the circuit. Is it possible to add some item within or along the circuit (and before the load)...

What am I missing here? I know USBs don't kill you so I know I've got something wrong. Google tells me that around 0.1A has a really good chance of killing you; and everything I read says it's the amps that kill you not the volts. So I know van der grafs and static shocks won't kill you. My...

my 3inch plasma globe needs 5V 300mA dc supply... Can I use an adapter with 4.5V and 50mA output rating? If can't then what will happen if I still do use it?

Hey all, working on a pet project where I need a microcontroller with a 40ma pin output to be amplified to 2A, op-amps can't do the job, and H bridge motor drivers will be too expensive i think considering the amount of motors I need. What is the cheapest and smallest way to do this? Any help...

Hello, I am new to any type of engineering and just have been working with Arduinos and other microcontroller lately for fun. I am creating a prototype for a project that requires me to use a 9V power supply with 1Amp to power the Arduino(note, the arduino only needs around 300mA to run). I...

Homework Statement [/B] A) If a laptop computer charger is designed for use in a country where mains voltage is 230V. Will the user still be able to charge the laptop computer in a country where the mains supply is 110V? B) Also what happens if a 110V charger is used in a country where the...

Are there any readily available op amps with built in resistors that give a fixed gain, say 5, 10, 50, 100 etc. A lot of times I need to boost a sensor output and I'm too lazy to find/solder resistors do it. I'd rather buy a bunch of pre-set amplifiers that are ready to be plugged in and...

This is just a quick question: A problem I'm working on says "a sinusoidal current of .5 amps (rms) and 5 kHz." Later, in the problem solution, I(t) is written as .5 \sqrt{2} \cos{(10^4 \pi t)}. I think I'm simply misunderstanding something about the construction of a current function when...

Hey all. So I am now trying to work on IF amps for a superhet AM receiver (medium wave) and found the following figure in the ARRL handbook: I have a couple of questions regarding these schematics. First and most importantly, do these work for IF signals (of 455KHz with BW of 18KHz)...

Hi, I am a bit confused about what exactly is being produced when someone uses a hand generator. I know P=R(I^2). Does this mean that if I have a hand crank that can produce 1 amp I can use a 200 ohm resistor and produce 200 watts of power. If this is the case it seems as though producing any...

Just want to amplify the difference of inputs.

Coversion -- how many amps in 310 kW? Hello all, I am engineering handicap, can someone help me figure out how many amps in 310 kW.

What's the maximum amps that can i get from an aa battery without damaging it and how fast that should happen? Also if i had 2 aa batteries and i want to get maximum amps, how it is better to connect them (series or paralel) and how much does it take them to discharge? (sorry for my poor...

Homework Statement So for one of my labs, I had to make a bistable multivibrator and observe the transfer characteristics. The circuit is setup as follows: http://i.imgur.com/1G4M7DE.jpg (Image is too big to be inserted in this forum) This resulted in the following hysteresis loop...

Edit: I solved it, and found that it should be 30v because that causes a 24v drop across 40kohm resistor which is 6v, which is equal to the voltage at the non inverting terminal, meaning Vout will be +VSat, but I don't understand why this is correct, because my notes say that if the voltage at...

Homework Statement Here is the problem: So this is a bistable multivibrator. Homework Equations KVL and KCL lawsThe Attempt at a Solution I don't entirely understand bistable multivibrators. I get what the solution is, the input voltage caps at 0.1V and the output caps at 0.7V and hysteresis...

so if i have 89.6g water at 304K and a constant p=1.00bar and i heat it by running 1.75A through 24.7 for 105 seconds what will the final temp be? im thinking i can take q=mC(Tf-Ti) and q=IT and I=R/V to say that Tf= (Rt/vCm)+Ti i can't rember that much about physics and this stuff...

Sorry if this seems like a simple question, but I am new to RF systems. Is there a difference between an RF amplifer and a single rail operational amplifer? Or can you boost the power of an RF signal with a generic op amp? Also, when dealing with an RF signal, are coax cables and SMA...

It says DC in 12volts but I'm not sure how many amps this thing can handle... I don't want to plasma myself so I was looking for helpful answers, thanks guys pic of globe (paid $8 not bad) http://postimg.org/image/462gwlj5v/

I always wanted to know how this worked? I know AMPs is how many Electrons move past one point in a SEC. I know that Voltage is the Force that drives the AMPs. I know that a House Outlet will supply 120 Volts at 15 Amps. Now take Christmass Tree Lights and to keep this easy let's...

Homework Statement What is the exact definition of negative feedback? the instructor told us that negative exists if the output is connected back to the inverting input through a passive element. But what exactly is precise the definition ? (say parallel connect, same two nodes, I want the...

Hi guys (and gals) Say, i have a solar panel rated at 100w 12v with the following specs: Short circult current(Isc): 6.01A Open circuit voltage(Voc): 21.5V Optimum operating current: (Imp) 5.52A Optimum operating voltage: (Vmp) 17.78v Maximum power: (Pmax) 100W And I decide to...