By J. Paley Yorke
The character of those relies on situations. A volume of electrical energy can be discharged via a compound liquid and the consequences produced will be chemical, heating, and magnetic. The liquid will be decomposed ;it will be heated by way of the passage of the electrical energy ;and approximately it there will be a magnetic box. but when an analogous volume be discharged via a cord there could purely be results produced, the heating and the magnetic. A achieve, if an identical volume be at relaxation on a physique there'll be no proof of any of those results ;but it may be shewn that the physique is able to attracting to itself any gentle debris of subject, and of repelling different our bodies equally charged with electrical energy. This charged physique wouldn't be heated via the resident electrical energy; there will be no signal of any magnetic box in its neighbourhood ;and if the cost have been resident on a liquid there will be no chemical influence for that reason. those are ordinary evidence and are summed up within the assertion that the phenomena of electrical energy in movement are diverse from these of electrical energy at leisure upon our bodies. while a physique is charged with electrical energy it's able to doing paintings it will possibly allure gentle debris of topic or repel equally charged our bodies and it for this reason possesses power as well as its gravitational strength. this extra power is electric power and will depend on the amount of electrical energy and the opportunity of the physique. P. Y.
(Typographical mistakes above are because of OCR software program and do not happen within the book.)
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Additional info for Applied Electricity-A Text-Book of Electrical Engineering for Second Year Student
This is easily done on squared paper. The difference between the reading of the tested ammeter and that of the standard ammeter are marked off as ordinates along DAG at right MEASUREMENT OF CURRENT STRENGTH 33 If the tested ammeter reads lower than it angles to AB. ought to read then the difference is marked off above the line AB and if it reads higher than marked off below the line. ; it should the difference is shews the curve of differences or of errors accordThe full line shews the errors going up and the dotted line shews the errors coming down the scale.
Instrument is received it is generally in proper adjustment and it is only necessary to adopt the above methods in case of a renewal of the suspension thread or in case of physical deterioration of the spring. Now when the current to be measured is passed through the dynamometer there will be a magnetic field set up about each coil. Fig. 13 illustrates the nature of this field. MM' 39A APPLIED ELECTRICITY 36 represents the movable and FF' the fixed coil as seen from The directions of the current in each coil and the above.
Fig. may coils be connected in series or in parallel according to the resistance required, but they must be so connected that the magnetic fields in each tend to same direction. If they produced would be no deflexion provided that deflect the needle in the effects there opposite the effects of each coil were equal. The needle is suspended by a fine fibre of unspun silk a mirror is attached, as shewn in the figure. and If the needle were astatic, the earth's field no effect upon it perfectly astatic ; but pair.