16) What are the two types of current? What is different about the flow of elect

Question

16) What are the two types of current? What is different about the flow of electrons? (think of our class demonstration) 17) What phenomena is responsible for how generators and motors work? 18) Light, electromagnetic wave, photons, radiation, all refer to the same phenomena and are synonyms 19) A changing magnetic field creates an electric field and a changing electric field creates a magnetic field 20) What phenomena is responsible for how motors and generators work and who discovered it? 21) What is an element's Atomic number tell you? 22) Matter is mostly empty space 23) Can electricity flow in an open circuit? 24) The unit of Power is Watts (say what!). The unit of Energy is Joules usually denoted by a J 25) What are the different ways that light interacts with matter? 26) What is the speed of light in miles per second? 27)Light is both a particle and a wave. Light is also massless (I forgot to say in class)!

Explanation / Answer

16) Direct current DC : electrons flow in single direction
Alternating current AC : electrons flow in 2 directions
17) Electromagnetic induction
18) Electromagnetic radiation (spectrum)
19) Electromagnetic field
20)  Electromagnetic induction, Michael Faraday discovered this
21) Atomic number gives number of protons present in the nucleus of the element and this decides
the position in periodic table.
22) Yes, 99.999 % of an atom consists of empty space the rest of 0.01% consists of nucleus, protons,
electrons etc
23) Yes it does flow, but it very much feeble and limited

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