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NESPOLA - putting technology to work
NESPOLA - putting technology to work

... facilitates on-line monitoring. All data is transmitted back to a secure database utilising modern communication networks at a programmable interval. The user is provided with a web login and password and able to quickly retrieve, view and download data on-line. Load Remote is ideal for monitoring l ...
OBJECTIVES 14. Solve numerical related to calculations of current
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... voltmeter, a low volt battery, LED / bulb, connecting wires, a switch / key, etc. to make the LED / bulb glow. Draw the diagram of the circuit (in the space provided) in which the bulb glows. Also, notice when do the ammeters show deflection. ...
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... Low bias currents It is common for telecomms transformers to have a small DC current flowing through the primary winding. It is important that when transformers are tested, the effects of any current (that will be present when the device is in circuit) are taken into account. In some telecomm transf ...
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chapter 4 - UniMAP Portal

... toward the fluorescent screen. The electrons that make up the beam are given off by thermionic emission from the heated cathode. The cathode is surrounded by a cylindrical cap that is at a negative potential. This cap, which has a small hole located along the longitudinal axis of the CRT, as shown ...
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Mercury-arc valve



A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC). It is a type of cold cathode gas-filled tube, but is unusual in that the cathode, instead of being solid, is made from a pool of liquid mercury and is therefore self-restoring. As a result, mercury-arc valves were much more rugged, long-lasting and could carry much higher currents than most other types of gas discharge tube.Invented in 1902 by Peter Cooper Hewitt, mercury-arc rectifiers were used to provide power for industrial motors, electric railways, streetcars, and electric locomotives, as well as for radio transmitters and for high-voltage direct current (HVDC) power transmission. They were the primary method of high power rectification before the advent of semiconductor rectifiers, such as diodes, thyristors and gate turn-off thyristors (GTOs) in the 1970s.
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