Downtown Sarajevo opened for business Tuesday, although technical difficulties were zapping the strength of the electrical flow.

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If everything's working, it'll display an electrical flow animation atop the picture, showing kids the magic of electricity.

ENGADGET

On Pandora, electrical currents flow through the root systems of the trees.

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Engineers had learned that a resistor, which restricts the flow of electrical current, is best made of certain materials and a capacitor, which stores electrical charge, of others.

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The problem is not only how to get rid of the heat, but how to cope with the very large electrical currents that must flow on and off the chip without melting the connecting leads.

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That led the relay, a kind of sensing device, to incorrectly conclude there was an electrical problem and tell a nearby electrical switch to isolate the perceived problem, reducing the flow of power to the Superdome during the game's third quarter.

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The two electrodes, cathode and anode, are separated by a polymer electrolyte membrane which permits protons to cross to reach the cathode while the electrons are made to flow as part of a circuit to carry an electrical current.

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