Voltages

Some articles on voltage, voltages:

Dynamic Voltage Scaling - Caveats
... overvolting is increased heat the power dissipated by a circuit increases with the square of the voltage applied, so even small voltage increases ... to the heat exceeds the potential gains from the higher voltages ... damage to circuits can occur very quickly when using high voltages ...
Hot Shoe - Voltages
... The trigger voltage (for a flash) between the center contact and the shoe have varied over the years, between manufacturers, and even in the same manufacturer ... a shutter were mechanical contacts, the actual voltage did not matter too much as long as it did not cause arcing, but now with electronic triggering, it can cause problems ... The ISO 10330 specification allows for a trigger voltage of 24 volts, some manufacturers, particularly Canon, ask for no more than 6 volts ...
Stray Voltage - Effects - Persons
... Small stray voltages may never be noticed and may only be detected with a voltmeter ... Larger voltages may have a range of effects, from barely perceptible to dangerous electric shocks, or unintended electrical heating resulting in fires ... attention must be paid to elimination of stray voltages ...
Live-line Working - Background - Electrical Hazards
... lack of any visible sign that a conductor is energised, even at high voltages, makes electricity a particular hazard ... At high voltages, it is unnecessary to come into direct contact with charged equipment to be shocked ... such as rubber, while excellent insulators at low voltages, are also subject to electrical failure if subjected to a high enough field ...
Origins of Stray Voltages - Coupled Voltages
... signs or conductors carrying alternating currents can have measurable voltage levels caused by capacitive coupling ... Since voltages detected by high-impedance instruments disappear or become greatly reduced when a low impedance is substituted, the effect is sometimes called phantom ... used by electricians, and might be seen, for example, when measuring the voltage at a lighting fixture after removing the bulb ...