Q. A current of 2A flows in a wire offering a resistance of 10ohm. Calculate the energy dissipated by the wire in 0.5 hours.

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Q. Practically, if 10kJ of energy is supplied to a device, how much energy will the device give back?

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Q. Materials which easily allow the passage of electric current are known as ______

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Q. A wire of length 2m and another wire of length 5m are made up of the same material and have the same area of cross section, which wire has higher resistance?

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Q. A wire having an area of cross section = 10sqm and another wire having an area of cross section= 15sqm, have the same length and are made up of the same material. Which wire has more resistance?

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Q. Which of the following statements are true with regard to resistance?

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Q. Which, among the following is a unit for resistivity?

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Q. What is the resistivity of Copper?

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Q. Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m² and 5m² respectively.

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Q. Which of the following statements are true with regard to resistivity?

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Q. The reciprocal of resistivity is________

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Q. The resistance of pure metals ___________

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Q. The resistance of insulators __________

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Q. Which of the following statements are true about metals?

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Q. Which of the following statements are true about insulators?

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Q. What is the unit of temperature coefficient?

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Q. A copper coil has a resistance of 200 ohms when its mean temperature is 0 degree centigrade. Calculate the resistance of the coil when its mean temperature is 80 degree centigrade. Temperature coefficient of copper is 0.004041 centigrade¯¹.

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Q. The temperature of a coil cannot be measured by which of the following methods?

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Q. The rise or fall in resistance with the rise in temperature depends on ________

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Q. If the temperature is increased in semi-conductors such that the resistance incessantly falls, it is termed as _______

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