. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 47—Mechanism of Voltmeter. AMMETER. the voltmeter except the resistance of the windings and the calibration. The coilsof the ammeter have relatively low resistance whereas the voltmeter as alreadymentioned, has high resistance. The windings of an ammeter may be proportioned to carry a small amount of current,but the meter can be used to measure very large values by connecting its terminalsacross an external shunt as in Fig. shunt consists of a number of metalstrips of comparatively low resi
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 47—Mechanism of Voltmeter. AMMETER. the voltmeter except the resistance of the windings and the calibration. The coilsof the ammeter have relatively low resistance whereas the voltmeter as alreadymentioned, has high resistance. The windings of an ammeter may be proportioned to carry a small amount of current,but the meter can be used to measure very large values by connecting its terminalsacross an external shunt as in Fig. shunt consists of a number of metalstrips of comparatively low resistancestretched between two large copperlugs. A potential difference exists acrossthe terminals of the shunt which causesa certain amount of the current to sub-divide and flow through the meter. Anincrease of current through the shuntwill increase the flow of current throughthe instrument, and the meter, therefore, ^.^ 48_showii:g the Use of a Shunt with an Ammeter,may be calibrated to read very large values of current, although but small values pass through the instrument itself. Suchinstruments are generally supplied with a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
