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KF5JRV > TECH 21.10.16 12:27l 15 Lines 761 Bytes #999 (0) @ WW
BID : 3959_KF5JRV
Read: GUEST
Subj: Inductance
Path: IZ3LSV<IW0QNL<VE2PKT<ZL2BAU<N0KFQ<KF5JRV
Sent: 161021/1125Z 3959@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
In 1830, Joseph Henry (1797-1878), discovered that a change in
magnetism can make currents flow, but he failed to publish this.
In 1832 he described self-inductance - the basic property of
inductor. In recognition of his work, inductance is measured in
henries.
The stage was then set for the encompassing electromagnetic
theory of James Clerk Maxwell. The variation of actual currents
is enormous. A modern electrometer can detect currents as low as
1/100,000,000,000,000,000 amp, which is a mere 63 electrons per
second. The current in a nerve impulse is approximately 1/100,000
amp; a 100-watt light bulb carries 1 amp; a lightning bolt peaks
at about 20,000 amps; and a 1,200-megawatt nuclear power plant can
deliver 10,000,000 amps at 115 V.
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