Magnet | - Part 2

How does an alternator works?

Wednesday, May 18, 2011

Hello there, I have done some research on this topic. I know alternator got 2 main parts rotar and stator, my question is about the rotar and stator. I would like to know whether the rotating part is got the rotating magenetic field (if that is the case, is it the magnet permant magnet or [...]

do electric bicycles with on-the-go rechargeable batteries exist?

Wednesday, April 27, 2011

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such as the peddles being hooked up to the wheels as well as one of those magnetic generators where a coil spins around a magnet that can constantly recharge the batteries and give a small boost to wheel turning? or would the electric output be too small?

Physical science help please… who can get it?

Sunday, April 24, 2011

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1. suppose you acquire a positive charge from walking across a carpet. you then touch a doorknob and receive a shock. this leaves you a. positively charged b. negatively charged c. electrically resistant d. electrically neutral 2. An instrument that can detect the presence of an electric charge is a a. magnet b. electroscope c. [...]

Would this provide perpetual energy?

Friday, April 22, 2011

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OKay imagine the following scenario. You are an astronaut floating in space, far far away from any significant gravitational entities. It’s just you and nothing. Now put some circles fabricated from copper wiring that is woven in the way you would find it in a standard electrical generator today. Maybe it’s actually just a tube [...]

Physical science help please… who can get it?

Thursday, April 21, 2011

1 Comment

1. suppose you acquire a positive charge from walking across a carpet. you then touch a doorknob and receive a shock. this leaves you a. positively charged b. negatively charged c. electrically resistant d. electrically neutral 2. An instrument that can detect the presence of an electric charge is a a. magnet b. electroscope c. [...]

Help: 1. explain how a simple ac generator (alternator) works.?

Saturday, April 9, 2011

2 Comments

2.The magnetic field between two poles of a magnet is increasing at the rate of 0.05T/s. A conducting loop of area = 100cm^2 is placed within this magnetic field. The loop is connected to a circuit whose total resistance is 10Ω. Find both the emf and the current that are induced in the circuit as [...]

Would it be possible to arrange capacitors in a series that would be able to discharge as they recharged?

Tuesday, April 5, 2011

2 Comments

Im making a device that is kinda like a generator that im going to use to drive a motor. The device has magnets that will be spun in front of a coil to create a current. There will be a weak field around the coil because there are a few different magnets on my rotor. [...]

Physics. Primary and secondary transformers. electromagnetic?

Monday, April 4, 2011

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1) The primary of a transformer has 350 turns and a voltage of 120 V across its terminals. What is the output voltage of the secondary if it has 180 turns? Answer:48V 2)An ac generator consists of a 135-turn circular planar coil that is able to rotate between the poles of a magnet. The magnetic [...]

Physics: Hello I just finished majority of my physic's homework but I still need help on some questions.?

Wednesday, March 23, 2011

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1. When the magnet is pushed into the middle coil, ____________ as much voltage is induced as in the coil on the left? 2. When the magnet is pushed into the coil on the right, _________ as much voltage is induced as in the coil on the left? 3. Another name for the generator effect? [...]

Does anybody know if magnetic fields need to alternate in order to produce a steady electrical current?

Thursday, March 17, 2011

3 Comments

I know that generators work by having a spinning copper coil in between a magnet with a north and south pole, but I was wondering what would happen if two south poles or two north poles were to spin over the copper coil. Would it produce a stable electric current? Or a negative or positive [...]