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Electromagnetism Questions?

Thursday, June 16, 2011

The scientist who first discovered a link between electricity and magnetism is a. Hans Oersted b. Albert Einstein c. Michael Faraday d. William Gilbert Which of the following is "not" a characteristic of a step-down transformer? a. There are fewer loops on the secondary coil than on the primary coil. b. It converts alternating current [...]

science help, por favor? please?

Friday, May 27, 2011

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Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. The process of generating an electric current by moving an electrical conductor relative to a magnetic field is called (1 point) A. magnetization. B. electromagnetic force. C. electromagnetic induction. D. alternating current. 2. A device that changes [...]

Chemistry/Physics question help please?

Saturday, May 21, 2011

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In a generator, the current produced in __________ when the loop is parallel to the surrounding magnetic field. a. zero current b. average c. very small d. at a maximum Describe how a step – down transformer works to reduce voltage. Use the vocabulary terms “primary coil,” “secondary coil” and “electromagnetic induction.” A __________ magnetic [...]

Anyone think that they could help with some science questions?

Friday, May 13, 2011

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8. A transformer has a primary coil with 500 turns and a secondary coil with 250 turns. If the output voltage is 240 volts, what is the input voltage? (1 point) 96 volts 120 volts 480 volts 500 volts 9. How are fossil fuels used to generate electrical energy? (1 point) Heat from burning fuel [...]

Magnet Questions. Five short mult. choice ones. Please help me? I give BA. (:?

Sunday, January 23, 2011

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Thanks in advance! 1. What is the concept called when the poles of an electromagnet flip? a. switching poles b. changing direction c. current d. transformer 2. Which of the following describes electromagnetic induction? a. using a magnet to create an electric current b. moving a loop of wire through a magnetic field to create [...]

Physics? Any contribution…thanks?

Saturday, December 4, 2010

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These are out of 50 multiple choice…these are left and need to check my answers. 1. A loop of wire with area 250 cm2 is falling with its plane vertical. The horizontal component of the earth’s magnetic field is 0.50G. What is the induced emf in the loop when its speed is 4.0 m/s? Assume [...]

Transformers.?

Monday, November 29, 2010

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I understand the basic workings of a transformer,the questions on them really difficult. This is one of the questions – I’d really like a guided explaination on how to tackle it. An audio-frequency tranformer, designed to operate at frequencies as low as 20Hz is used to transform the 5ohm resistance of a secondary load into [...]

Transformer Question?

Sunday, November 28, 2010

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I understand the basic workings of a transformer,the questions on them really difficult. This is one of the questions – I’d really like a guided explaination on how to tackle it. An audio-frequency tranformer, designed to operate at frequencies as low as 20Hz is used to transform the 5ohm resistance of a secondary load into [...]

Easy 20 question multiple choice quiz if you're good at physics.?

Tuesday, September 28, 2010

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Please help I don’t know this stuff Question 1 Marks: 1 A step-up transformer increases Choose one answer. a. energy. b. power. c. both A and B d. none of the above Question 2 Marks: 1 A device that transforms electrical energy to mechanical energy is a Choose one answer. a. generator. b. transformer. c. [...]

constructing a uniform magnetic field with a transformer from a rhumkorf generator?

Friday, July 30, 2010

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hello thank you for reading this question, i have a iron cored dc-ac transformer (relies on interrupter to constantly break circuit to induce induction in secondary coil) a brief and crude diagram can be found here:http://img684.imageshack.us/img684/990/induct.jpg. What i wish to do with this extracted component from an inductorium is use it to create a magnetic [...]