61. 18 volts = . . . . . . . . × 3 ohms
62. Of the two bulbs in a house, one glows brighter than the other. In this context which of the following statements is correct?
63. After using for some time, big transformers get heated up. This is due to the fact that
1. current produces heat in the transformers.
2. hysteresis loss occurs in the transformers.
3. liquid used for cooling gets heated.
Select the correct answer:
1. current produces heat in the transformers.
2. hysteresis loss occurs in the transformers.
3. liquid used for cooling gets heated.
Select the correct answer:
64. The potential difference between the terminals of an electric heater is 60V when it draw of current of 4A from the source. What current will the heater draw if the potential difference is increased to 127.5 V?
65. In electrical motor
66. Which of the following devices is not based on the heating effect of electric current?
67. Superconductors are those elements
68. Those wires which transmit electricity in houses having a coating of . . . . . . . .
69. A closed and continuous path of electric current circuit is called?
70. Which gas is filled in normal tubelights?
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