71. 
Use of signal in an electrical circuit. It is indicated by . . . . . . . .?
Use of signal in an electrical circuit. It is indicated by . . . . . . . .?72. Why does the core of a transformer is laminated?
73. What do the given symbol in figure represents in a reference of electric circuit?
74. An electric bulb of 100 W is used for 8 hours per day. The energy used by a bulb in a day is . . . . . . . . unit
75. To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor
76. The power of an electric bulb with 240 V and 0.6 A current will be . . . . . . . .?
77. The purpose of choke in a fluorescent lamp is
78. What is electromagnetic induction?
79. The electromagnet has?
80. If the resistance of a conductor is reduced to half, its thermal effect will be . . . . . . . .
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