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2. Orders of magnitude (voltage) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(voltage)

   Range used in North American power high-voltage transmission substations [25] 10 5: 345–800 kV Range used in EHV power transmission systems [29] [30] 800 kV Lowest voltage used by ultra-high voltage (UHV) power transmission systems [31] [30] Mega-10 6: 3 MV Used by the ultra-high voltage electron microscope at Osaka University [32] 10 7: 25.5 MV

3. Test probe - Wikipedia

   en.wikipedia.org/wiki/Test_probe

   Either way, the probe must be adjusted so that it provides uniform attenuation at all frequencies. This is referred to as compensating the probe. Compensation is usually accomplished by probing a 1 kHz square wave and adjusting the compensating capacitor until the oscilloscope displays the most square waveshape. Most oscilloscopes have a 1 kHz ...

4. Thermopile - Wikipedia

   en.wikipedia.org/wiki/Thermopile

   The output of a thermopile is usually in the range of tens or hundreds of millivolts. [7] As well as increasing the signal level, the device may be used to provide spatial temperature averaging. [8] Thermopile, composed of multiple thermocouples in series. If both the right and left junctions are the same temperature, voltages cancel out to zero.

5. Four-terminal sensing - Wikipedia

   en.wikipedia.org/wiki/Four-terminal_sensing

   Four-point measurement of resistance between voltage sense connections 2 and 3. Current is supplied via force connections 1 and 4. In electrical engineering, four-terminal sensing (4T sensing), 4-wire sensing, or 4-point probes method is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements ...

6. Current clamp - Wikipedia

   en.wikipedia.org/wiki/Current_clamp

   An electrical meter with integral AC current clamp is known as a clamp meter, clamp-on ammeter, tong tester, or colloquially as an amp clamp. A clamp meter measures the vector sum of the currents flowing in all the conductors passing through the probe, which depends on the phase relationship of the currents. Only one conductor is normally ...

7. Thermocouple - Wikipedia

   en.wikipedia.org/wiki/Thermocouple

   Some combined main burner and pilot gas valves (mainly by Honeywell) reduce the power demand to within the range of a single universal thermocouple heated by a pilot (25 mV open circuit falling by half with the coil connected to a 10–12 mV, 0.2–0.25 A source, typically) by sizing the coil to be able to hold the valve open against a light ...

8. Current–voltage characteristic - Wikipedia

   en.wikipedia.org/wiki/Current–voltage...

   When it is operating in the second or fourth quadrant, current is forced to flow through the device from the negative to the positive voltage terminal, against the opposing force of the electric field, so the electric charges are gaining potential energy. Thus the device is converting some other form of energy into electric energy.

9. Passive sign convention - Wikipedia

   en.wikipedia.org/wiki/Passive_sign_convention

   Illustration of the "reference directions" of the current (), voltage (), and power () variables used in the passive sign convention.If positive current is defined as flowing into the device terminal which is defined to be positive voltage, then positive power (big arrow) given by the equation = represents electric power flowing into the device, and negative power represents power flowing out.