Index
efficiency (cont.)
    of a simple machine     341
    of heat engine     740
    of photovoltaic power     294
    of rubber band launcher     288
egg-drop design project         310
Einstein, Albert         2
    general relativity     221
    special relativity     91
El Niño         712
elastic
    material property     247
elastic collision         321
elastic potential energy         259
elasticity
    concept of     150
electric charge         521
electric circuit
    breadboard circuits     474
    definition of     473
    in AC household electricity     500
    parallel     489
    series     487
electric current         264
    nature of     472
electric field         526
    equation for     530
    interactive simulation     528
    of a point charge     533
    of parallel plate capacitor     537
    of point charges     527
electric field lines         526
electric generator         558
electric motor         551
    interactive simulation     552
electric potential         533
electric power         264
electrical
    safety     52
electrician         24
electricity
    definition of     472
    history of     470
    static     519
electromagnet         549
    built from a nail and wire     550
    in electric motors     551
electromagnetic induction         556
    by magnet moving in a solenoid     557
electromagnetic spectrum         641
electromagnetic waves         632
    comparison to sound waves     641
electromagnetism
    discovery of     548
electromotive force (emf)         557
electron         752
electron (cont.)
    charge of     531
electron cloud         756
electron flow         475
electron microscope         776
electron volt         763
electroscope         523
electrostatic induction         523
electrostatics         519
electroweak interaction         815
elementary charge e         753
    discovery of     531
elementary particles         753
elements         758
    Aristotle’s four     44
ellipse
    as a form of orbit     215
emf, see electromotive force  
emission spectra         764
emissivity ε         715
energy
    and color of light     21
    and power     263
    as mediator of change     254
    chemical energy     254
    definition in terms of work     255
    due to pressure     254
    elastic potential energy     259
    electrical energy     254
    from nuclear fusion     809
    gravitational potential energy     257
    in agriculture     267
    in capacitors     536
    in gasoline     669
    in joules     255
    in nuclear reaction     806
    in oscillators     392
    in resonant systems     401
    kinetic energy     256
    mechanical energy     254
    nature of     4
    nuclear binding energy     791
    nuclear energy     254
    of a wave     414
    radiant energy     254
    saved by recycling     296
    solar power     27
    sources of electrical energy     27
    technology     291
    the age of energy     252
    thermal energy     254
    transformations     554
    travels through waves     410
    ultimate derivation of     27
    usage in USA     27
energy levels         763
    interactive simulation of hydrogen atom     766
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