Photoconductive cells are light-sensitive resistors, in which resistance decreases with an increase in light intensity when illuminated

Rechargeable batteries or secondary batteries contain active materials that can be regenerated by charging. When the energy produced by rechargeable batteries drops below optimum efficiency, secondary batteries may be recharged in a couple of ways, depending upon their construction. 

Industrial batteries translate chemical energy into electricity.

Battery packs are constructed from two or more individual cells or batteries

Ion selective electrodes measure the potential of a specific ion in solution. This potential is measured against a stable reference electrode of constant potential.

Battery and fuel cell test equipment consists of specialized test stations, stands or systems, monitors and component modules for performance or endurance testing. 

Load cells are transducers for force and load measurement, often with mounting packaging.  They are widely used in testing, instrumentation, and as components in larger devices such as scales

Helium cadmium (HeCd) lasers are relatively economical, continuous-wave sources for violet (442 nm) and ultraviolet (325 nm) output. They are used for 3-D stereolithography applications, as well as for exposing holographs

Photovoltaic cells generate a voltage when radiant energy falls on the boundary between dissimilar substances

Fuel cells produce electricity and heat electrochemically by combining oxygen from the air with a fuel, preferably hydrogen, from methanol, natural gas, or petroleum. Reformers are often used in conjunction with fuel cells

Electrical contacts and contact materials are soft, high-conductivity, oxidation- resistant materials that are used in circuit breakers, relays, switches, and electrical discharge machining (EDM) applications.  They often have a second phase in order to provide anti-welding and/or arc resistance.

Telephones and cell phones convert voice or other sound signals into a form that can be transmitted to another device that receives and reconverts the waves back into sound

Cell processors are multi-core processors that use cellular architecture for high performance distributed computing. They are made of hardware and software cells whose interoperability is similar to how neural cells perform in the human brain

Braze and brazing alloys join metals or other materials without extensive fusion of the substrates. Brazes have a higher melting point (>800° F) than solders and cause little or no metal vaporization, gain growth, stress corrosion, or distortion.

Manufacturing cells and systems consist of a number of machines organized together to perform multiple operations on a workpiece