A fuel cell (actually a group of cells) has essentially the same kinds of components as a battery.
Cutaway view of a typical construction of a miniature power cell, as in a zinc-silver oxide or zinc-mercuric oxide system.
Modern version of the Leclanche cell. This heavy-duty zinc-carbon primary battery is a dry cell with an immobilized electrolyte.
Proton exchange membrane (PEM) fuel cell.
Nickel (hydroxide)-cadmium cell of “jelly roll” construction. This rechargable battery is commonly used in portable devices.
The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.
Georges Leclanche's dry cell and its later variations, zinc chloride and alkaline cells, are batteries commonly used worldwide.
Cutaway view of an alkaline-manganese dioxide power cell.
Cross section of a V-type engine.
Diesel engine equipped with a precombustion chamber.
A grid-connected solar cell system.
Basic components of an electrochemical cell.
Automotive-type lead-acid battery, a storage battery that holds its charge for a long time and can be recharged.
Typical gasoline engine cooling system.
Solar cells, whether used in a central power station, a satellite, or a calculator, have the same basic structure.
The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.
Elements of a magnetron, used to generate power for radar systems, microwave ovens, plasma screens, and linear accelerators.
Diagram of a two-cavity klystron, used as an amplifier and RF signal source at microwave frequencies, and also as an oscillator.
The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.
An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.
Typical gasoline engine lubrication system.
Four types of gasoline engines: opposed-piston engine, rotary engine, in-line engine, and V-type engine.
Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.
A tokamak is a toroidal magnetic confinement system used as a method of achieving fusion energy.
Gyrotron, electrons from the cathode acquire cyclotron rotation in the cavity.
Elements of the traveling-wave tube (TWT), used to amplify microwave signals over broad bandwidths.
An electron (e) in a solar cell interacting with light and dissipating excess energy is analogous to a child playing on a slide.
U.S. space station Skylab (occupied 1973-74), shown with docked Apollo Command and Service modules.
A cutaway view shows how light passes through the lenses and prisms of binoculars.
The Apollo program: the Saturn V launch vehicle and configurations of the spacecraft modules at launch and during the journey.
A heart-lung machine diverts blood from the body to an oxygenator, which removes CO2, adds O2, and returns the blood to the body
The Michelson interferometer measures the effect on the speed of light of the motion of the ether through which light travels.
The components of a scanning electron microscope (SEM).
The components of a transmission electron microscope (TEM).
Vegetation profile of a grassland.
Vegetation profile of a desert.
Vegetation profile of a temperate deciduous forest.
Cross section of a typical bomb calorimeter.
Diagram of a mammalian muscle spindle.
The stages in the evolution of a wave (frontal) cyclone.
The diffusion of water across a semipermeable membrane.
Schematic drawing of the structure of a typical bacterial cell of the bacillus type.
The steps involved in the engineering of a recombinant DNA molecule.
Diagram of a wave system depicting typical divergence and convergence distributions for non-tilting and tilting systems.
General patterns of atmospheric circulation over an idealized Earth with a uniform surface and the actual Earth.
Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population.
Basic characteristics of orbits in which a satellite can be placed around Earth, categorized by inclination, shape and altitude.
U.S. space shuttle, composed of a winged orbiter, an external liquid-propellant tank, and two solid-fuel rocket boosters.
Two types of pressure gauge: the U-tube manometer and the Bourdon-tube gauge.
Fission bomb designs
Thermonuclear warhead
Pay-off matrix showing bourgeois, or mixed attack/retreat behaviour, as the most stable strategy for a population.
Rising air in an unstable atmosphere
Coriolis force
Electron shell
Compton effect
Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.
Vegetation profile of tropical mountain lands.
The process of cell division by mitosis.
Stages in the process of meiosis, cell division among sexually reproducing organisms.
Receptor-mediated endocytosis enables cells to ingest molecules such as protein that are necessary for normal cell functioning.
The endoplasmic reticulum plays an important role in the biosynthesis, processing, and transport of proteins and lipids.
Transverse section of an artery.
Human arterial supply and venous drainage of the organs.
Average exchange of energy between the surface, atmosphere, and space, as percentages of incident solar radiation.
Horizontal divergence and convergence patterns associated with the polar-front jet.
The onset and retreat of the West African monsoon with respect to the timing of the direct rays of the sun.
Electromagnetic spectrum. The visible range (shaded portion) is shown enlarged on the right.
Types of faulting in tectonic earthquakes.
Seismic ray types in Earth's interior from earthquake at F.
Evolutionary history of the globin genes. The dots indicate the duplication of ancestral genes, giving rise to new gene lineage.
The Hardy-Weinberg Law applied to two alleles.
The journey of the Galileo spacecraft to Jupiter, highlighting major observations along the trajectory, as well as their dates.
The analysis of sound frequencies by the basilar membrane.
The two sensory organs of balance: the cristae of the semicircular ducts and the maculae of the utricle and saccule.
Electric lamp and circuit symbol, illustration
Circuit board, illustration
Apollo mission profile for a lunar landing and return, outlining the various stages along the mission.
The diffusion of potassium cations across a semipermeable membrane.
Diagram of a human uterus during the fourth month of pregnancy.
Annual circulation patterns in a dimictic lake: stratification in the summer and complete overturn in the autumn and spring.
Four main types of estuaries: A) salt wedge estuary, B) partially mixed estuary, C) vertically homogeneous estuary, D) fjord.
Vegetation profile of a boreal forest. The tree layer consists mainly of conifers, and mosses are the predominant ground cover.
Light waves matching the orientation of the molecules of a polarizing filter are absorbed, reducing the intensity of the light.
Comparison of a normal heart to one with a ventricular septal defect
Diagram demonstrating the difference between a normal heart and a heart with an atrial septal defect
The surface reflectance differences between a pre-agricultural (forest) and a modern agricultural (patchwork heating) landscape.
Diagram showing a healthy heart valve compared with a diseased heart valve and an artificial heart valve.
Generated by an undersea earthquake, a tsunami may propagate over open ocean waters before cresting and inundating a coastline.
Earth's prebiotic and modern atmosphere
Phylogeny based on differences in the protein sequence of cytochrome c in organisms ranging from Neurospora mold to humans.
Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.
Diagram of an artificial pacemaker
Muscle structure, artwork
Space station Mir, after its completion in 1996, with the launch dates of each modular component shown.
Light-emitting diode and circuit symbol, illustration
Electrolytic capacitor and circuit symbol, illustration
Electric motor and circuit symbol, illustration
Electric buzzer and circuit symbol, illustration
Simple lighting circuit, illustration
Two lamps connected in parallel, illustration
Bohr atomic model
Changes in ion permeance underlying the action potential.
Theoretical depiction of the movement of tectonic plates across Earth's surface.
Diagram depicting the process of atoll formation. Atolls are formed from the remnant parts of sinking volcanic islands.
Theoretical diagram showing the effects of an advancing tectonic plate on other adjacent, but stationary, tectonic plates.
Differentiation of the external genitalia in the human embryo and fetus.
Height of space from Earth, illustration
Cardiac stress test, artwork
Polar covalent bond
The weather model of meteorologist Edward Lorenz.
Displacements in the Earth in four types of free vibrations.
The artery wall and the ultrastructure of the smooth muscle cells within it.
Annual temperature and precipitation patterns for several locations with different climatic conditions.
Uniformly accelerated motion; s = speed, a = acceleration, t = time, and v = velocity.
In Ptolemy's geocentric model of the universe, the Sun, Moon, and each planet orbit a stationary Earth.
Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest.
Rheostat resistor, illustration
Electric cell and circuit symbol, illustration
Hydrogen fuel cell, illustration
Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.
Chemical composition of nicotine, conceptual image
人工衛星 上向き アイソメトリック
人工衛星 アイソメトリック
AC generator, illustration
Cross section comparing the left ventricular wall of normal heart to a left ventricular wall that has experienced hypertrophy.
The 4-D space-time continuum is distorted in the vicinity of any mass, depending on the mass and the distance from the mass.
Ionic bond
Raybox, illustration
Electrolysis, illustration
Drinking through a straw, illustration
Electric switch and circuit symbol, illustration
Fixed resistor and circuit symbol, illustration
Variable resistor and circuit symbol, illustration
Light-dependent resistor and circuit symbol, illustration
Two lamps connected in series, illustration
Two lamps connected in parallel, circuit diagram
Rotary potentiometer, illustration
Electric bell mechanism, diagram
Marey's sphygmograph, 19th century illustration
Mechanism of enzyme action, illustration
Human muscle structure, artwork
Animal cell structure
Trieste bathyscaphe, 1963 illustration
Electronic semiconductor integrated component, vector illustration
Deep brain stimulation, illustration
Zinc-carbon battery, illustration
Diode and thermionic emission, diagram
Cathode ray tube, illustration
Ammeter and circuit symbol, illustration
Lamp, cell and ammeter connected in series, illustration
Pythagorean theorem, illustration
Internal structure of Mercury, illustration
Internal structure of Earth, illustration
Atmospheric pressure glass trick, illustration
Wormhole through hyperspace, artwork
Male urogenital system, artwork
Female reproductive system, artwork
Gender characteristics, artwork
Protein synthesis, artwork
Gate control theory of pain, artwork
Gas engine piston, illustration
Electric vehicle power comparison, illustration
Goose barnacle anatomy, artwork
An active-matrix thin-film transistor (TFT) liquid crystal display. A TFT is associated with each pixel of the display screen.
The mechanical components of a compound microscope.
Cross section of a crystal microphone.
Electromagnet, illustration
Motor effect, illustration
Pressure exerted by a sharp knife, illustration
Pressure exerted by finger pushing a nail into wood, illustr
Shadow cast by a large light source, illustration
Shadow cast by a small light source, illustration
Icon Steam iron on white circle with a long shadow
Hydraulic lift, illustration