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Current Electri...

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  • Question 1
    4 / -1

    The resistance of a heating element is 99Ω at room temperature. What is the temperature of the element if the resistance is found to be 116Ω? (Temperature coefficient of the material of the resistor is 1.7 × 10−4∘C−1)

  • Question 2
    4 / -1

    The resistance of the wire in the platinum resistance thermometer at ice point is 5Ω and at steam point is 5.25Ω. When the thermometer is inserted in an unknown hot bath its resistance is found to be 5.5Ω. The temperature of the hot bath is

  • Question 3
    4 / -1

    The resistance of wire in a heater at room temperature is 65Ω. When the heater is connected to a 220V supply the current settles after a few seconds to 2.8A. What is the steady temperature of the wire. (Temperature coefficient of resistance α = 1.70 × 10−4∘C−1)

  • Question 4
    4 / -1

    A wire has a resistance of 2.5Ω at 28∘C and a resistance of 2.9Ω at 100∘C. The temperature coefficient of resistivity of material of the wire is

  • Question 5
    4 / -1

    Figure (a) and figure (b) both are showing the variation of resistivity (p) with temperature (T) for some materials. Identify the types of these materials.

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