Engineering

Finding the best diameter and height for a tin that will contain 1 litre of paint.

Ok, I have a maths assignment due tomorrow, and I do not know how to do it. The question is mainly about finding the best diameter and hight for a tin that will contain 1 litre of paint. What is the e

Can I reverse an transformer

So I gutted an appliance that died for parts that I want to use in a project Im working on and my biggest problem is the part I gutted is 115V and I need to run it off of batteries. So I also took a t

The rating of an electric oven is 4400W;220V.calculate its resistance when it operates at 220V.also calculate

the energy consumed in kWh in the month of september if the oven is used daily for 5hrs at the rated voltage. write the full procedure not only answer-Power = Current*Voltage Therefore, 4400 = I*220

CO2 emissions from a fossil fuel power station

More specifically can anyone tell me the CO2 emissions associated with delivering 1kWh to the end user - I appreciate it may be different depending upon whether its oil, gas, or coal fired but some so

Do engine armatures have bridge rectifiers in them

Ok Im just going to explain the whole situation. I have this armature from a weed whacker and I decided to power it with a large coil from an electric motor. It gives off a good arc, about a half inch

Wound motor torque formula

I need to replace 3 phase wound motor (with reostat) with a squirel-cage motor feed via inverter. Got to choose a motor capable to start moving the load (high inertia load). How to determide the actu

What type of engineering goes best as a double major with physics

Electrical engineering is a good match.The physics will help to understand the underlying principles of electrical engineering, particularly E&M and the quantum physics and materials behind transistor

Are these suitable replacement transistors

http://i42.tinypic.com/2jite.png Despite what the pic says, im on 125v mains here ok so im wanting to build this as a fun project and possibly use it as a bench top power supply if it ends up working.

What are the symbols in this equation

This is for phase velocity (vp) and group velocity (vg). sin⁡[2p/λ (x-vt)] cos⁡[(ωt-kx)] vp=λ/t=fλ=w/k vg=dw/dk The original can be found here: http://www.hep.man.ac.uk/u/roger/PHYS103… Whoever get

How much power is consumed when an appliance is in "sleep" mode

Hi guys Im doing a project where I need to make a power usage graph containing Watt ratings of every appliance in my house. What Im trying to figure out is how much power an appliance uses when it is

How to lower shaft speed rpm

if i put 10 tooth sprocket on the shaft that spins 1750, add chain. then put 100 tooth sprocket on a second shaft, use the chain to connect, would it get 170 rpm on second shaft, or am i thinking wron

Whats the best way to throw water

The more the better and as far as possible-1)skim your hand along the water surface at an angle. badly done you make a spray or wave - done well you throw a sheet of water. can be 3-4 meters and good

Calculate frequency at which gain is unity

Given, G(s) =7/s+5 calculate the frequency at which the gain is unity-|gain| is 7/sqrt(w^2+5^2). Thus, at unity gain,7^2 = 49 = w^2+25. From this, w = sqrt(24), and f is w/(2.pi)= 0.78Hz.-7 Hz

Energy loss question (thermodynamics)

In the figure (not to scale) a special wall has three metal studs with conductivity of 265 W/m·K. The wall otherwise has a conductivity of 0.88 W/m·K. What is the energy loss per second to the nearest

On a lightning strike,3 pins plug safer than a two pins plug?what is the difference

hi