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www.GOALias.blogspot.com3. Using an electromagnet, you can make a working model of a railwaysignal as shown in Fig.14.26.ThreadCardboard signalIron nailCoilFig. 14.26 A working model of a railway signal4. Visit an electric shop. Request a mechanic to show you the varioustypes of fuses and MCB and to explain how they work.You can read more on the following website:www.glenbrook.k12.il.us/gbssci/phys/class/circuits/u9l2a.htmlDid You Know?The credit for the invention of the electric bulbis usually given to Thomas Alva Edison, thoughothers before him had worked on it. Edisonwas a remarkable man. He made some 1300inventions including the electric bulb,gramophone, the motion picture camera andthe carbon transmitter, which facilitated theinvention of the telephone.Fig. 14.27 Thomas Alva Edison(A.D. 1847 – 1931)173ELECTRICCURRENTAND ITS EFFECTS173