Cells, Maximum Power & Heating Effect questions with solutions

Showing 1–10 of 48 questions

• MCQmediumCurrent electricityCells, Maximum Power & Heating Effect

  A rigid container with thermally insulated walls contains a coil of resistance 100 Ω, carrying current 1A. Change in internal energy after 5 min will be

  Options

  • Option A

    zero

  • Option B

    10 kJ

  • Option C

    20 kJ

  • Option D

    30 kJ

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• NumericmediumCurrent electricityCells, Maximum Power & Heating Effect

  A heater is designed to operate with a power of 1000 W in a 100 V line. It is connected in combination with a resistance of 10 Ω and a resistance R, to a 100 V mains as shown in figure. For the heater to operate at 62.5 W, the value of R should be ______ Ω.

  

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  JEE Mains 2024 08 Apr Evening Shift

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• MCQmediumCurrent electricityCells, Maximum Power & Heating Effect

  Three long conducting plates A, B and C carry charges +q, -2q and +q as shown. Plates A and C are fixed. If switch S is closed and l₁ > l₂, determine the initial direction of motion of the middle plate B.

  

  Options

  • Option A

    Leftward direction

  • Option B

    Rightward direction

  • Option C

    will not move

  • Option D

    First move leftward & then rightward

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• Multi-correctmediumCurrent electricityCells, Maximum Power & Heating Effect

  Figure shows the net power dissipated in R versus the current in a simple circuit shown.

  

  Select all that apply

  • Option A

    Internal resistance of the battery is 0.2 Ω

  • Option B

    Emf of the battery is 2 V

  • Option C

    R for which power is 5 W is 2.5 Ω

  • Option D

    At i = 2 A, power is 3.2 W

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• NumericmediumCurrent electricityCells, Maximum Power & Heating Effect

  Eight identical 1 volt cells are connected to make a ring as shown in the Figure. An ideal voltmeter is connected as shown. What will be its reading?

  

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  Current Electricity Objective Conversion

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• MCQeasyCurrent electricityCells, Maximum Power & Heating Effect

  Ratio of thermal energy released in two resistors R and 3R connected in parallel in an electric circuit is:

  Options

  • Option A

    3 : 1

  • Option B

    1 : 1

  • Option C

    1 : 3

  • Option D

    1 : 27

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  JEE Mains29 January 2023Shift 1Morning Shift

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• MCQmediumCurrent electricityCells, Maximum Power & Heating Effect

  A motor operating on 100 V draws a current of 1 A. If its efficiency is 91.6%, the source paper gives the loss of power in units of cal/s as:

  Options

  • Option A

    4

  • Option B

    8.4

  • Option C

    6.2

  • Option D

    2

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  JEE Mains 2025 3 April Evening Shift

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• Multi-correctmediumCurrent electricityCells, Maximum Power & Heating Effect

  In Circuit-1 and Circuit-2, R₁ = 1 Ω, R₂ = 2 Ω and R₃ = 3 Ω. P₁ and P₂ are the powers dissipated with switches S₁ and S₂ open, respectively. Q₁ and Q₂ are the powers dissipated with S₁ and S₂ closed, respectively. Select the correct statements.

  

  Select all that apply

  • Option A

    With a 6 V source across A and B in both circuits, P₁ < P₂.

  • Option B

    With a 2 A constant-current source across A and B in both circuits, P₁ > P₂.

  • Option C

    With a 6 V source across A and B in Circuit-1, Q₁ > P₁.

  • Option D

    With a 2 A constant-current source across A and B in both circuits, Q₂ < Q₁.

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  JEE Advanced 2022

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• NumericmediumCurrent electricityCells, Maximum Power & Heating Effect

  If a cell of constant E.M.F. produces the same amount of the heat during the same time in two independent resistors R₁ and R₂, when they are separately connected across the terminals of the cell, one after the another, internal resistance of the cell is ( R₁ R₂ ) n/2 . Find the value of n.

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• IntegermediumCurrent electricityCells, Maximum Power & Heating Effect

  Two cells of emfs 1 V and 2 V and internal resistances 2 Ω and 1 Ω respectively are connected in series with an external resistance of 6 Ω, giving current I₁. The same cells are then connected in parallel with the same external resistance, giving current I₂. If I₁/I₂ = x/3, find x.

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  JEE Mains 2025 3 April Evening Shift

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