Practical Physics Fundamental Principles And Applications to Daily Live
Practical Physics Fundamental Principles And Applications to Daily Live
Newton Henry Black
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The es- sential part of a fuse is a strip of an alloy [Fig. 291 (a)], which melts at such a low temperature that the melted metal can do no . . . . FIG. 291. Fuses: (a) wire fuse; (6) car- narm. Ine size 01 trie iuse tridgefuse; (c) plug fuse. ELECTRIC POWER 333 FIG. 292. Circuit breaker. is such that if by accident too heavy a current is sent through the wires, the fuse melts and breaks the circuit. At the mo- ment the fuse melts there is an arc across the gap which might set things on fire. S...o the fuse is commonly inclosed in an asbestos tube, as in the " cartridge fuse " [Fig. 291 (&)], or in a porcelain cup, which screws into a socket like a lamp, as in the " plug fuse " [Fig. 291 ()]. When the fuse wire melts because of excessive current, the fuse is said to "blow out. " A circuit breaker (Fig. 292) is simply a large switch which is automatically opened by an electromagnet when the cur- rent is excessive. 331. How much heat is generated by an electric current? The energy delivered to an electric heating coil, such as a flatiron, or soldering iron, is, as we have seen in section 326, El joules per second, or Elt joules in t seconds.
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