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Heat Effects

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-339

2025-11-30

414

The amount of current that passes when a charged body is discharged through a conductor is but small, and the heating of the conductor is consequently little. When the discharge take: place through a nonconductor, however, the effect is much greater. The spark itself is evidence of this, since in this case enough heat is given off to produce light. The spark is sometimes used to light the gas in buildings where the chandeliers cannot be readily reached.

Demonstration. - Bring a gas jet between the terminals of a machine. Operate the machine until the sparks pass, and then turn on the gas. It is lighted at once. Why?