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KF5JRV > TECH 27.11.16 21:55l 6 Lines 962 Bytes #999 (0) @ WW
BID : 5871_KF5JRV
Read: GUEST
Subj: Analog Ammeter
Path: IW8PGT<F1OYP<IZ3LSV<IK6ZDE<VE2PKT<KE0GB<KQ0I<KF5JRV
Sent: 161123/1315Z 5871@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
An ammeter is some form of galvanometer or electrodynamometer graduated so that the current strength in ampéres may be directly read from the scale. A form of ammeter much used for direct currents consists of a sensitive moving-coil galvanometer in which the coil instead of being suspended is mounted in jeweled bearings and is held in equilibrium by two non-magnetic spiral springs which also serve as conductors for the current. The main current passes through a strip of metal (called a shunt) having very small resistance, only a minute portion of.the current passing through the delicate movable coil. But the current in the movable coil is always the same proportional part of the whole current, and therefore the scale over which the pointer moves may be so graduated as to show directly the number of ampéres in the total current. An instrument of this type has the advantage of having a very small resistance.
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
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