1.

    A 100 W bulb is designed to operate at 220 V. If it is connected across a 110 V source, assuming the resistance remains constant, what power will it dissipate?

    A

    100 W

    B

    50 W

    C

    25 W

    D

    200 W

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Hard
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Electric Power, Voltage, Resistance

    Related Questions

    1.

    Two bulbs consume same power when operated at 200  V{\rm{200}}\,\,{\rm{V}} and 300  V{\rm{300}}\,\,{\rm{V}} respectively. When these bulbs are connected in series across a DC{\rm{DC}} source of 400V{\rm{400 V}}, then the ratio of power consumed across them is

    A

    $\begin{array}{*{20}{l}}

    {{\rm{2/3}}}

    \end{array}$

    B

    $\begin{array}{*{20}{l}}

    {{\rm{3/2}}}

    \end{array}$

    C

    $\begin{array}{*{20}{l}}

    {{\rm{4/9}}}

    \end{array}$

    D

    $\begin{array}{*{20}{l}}

    {{\rm{9/4}}}

    \end{array}$

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Electrical Power, Resistance, Series Circuits

    2.

    Two bulbs consume same power when operated at 200  V{\rm{200}}\,\,{\rm{V}} and 300  V{\rm{300}}\,\,{\rm{V}} respectively. When these bulbs are connected in series across a DC{\rm{DC}} source of 400V{\rm{400 V}}, then the ratio of power consumed across them is

    A

    $\begin{array}{*{20}{l}}

    {{\rm{2/3}}}

    \end{array}$

    B

    $\begin{array}{*{20}{l}}

    {{\rm{3/2}}}

    \end{array}$

    C

    $\begin{array}{*{20}{l}}

    {{\rm{4/9}}}

    \end{array}$

    D

    $\begin{array}{*{20}{l}}

    {{\rm{9/4}}}

    \end{array}$

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Power, Resistance, Series Circuits

    3.

    A coil takes 15  min{\rm{15}}\,\,{\rm{min}} to boil a certain amount of water; another coil takes 20  min{\rm{20}}\,\,{\rm{min}} for the same process. Time taken to boil the same amount of water when both coils are connected in series

    A

    5  min{\rm{5}}\,\,{\rm{min}}

    B

    8.6  min8.6\,\,{\rm{min}}

    C

    35  min{\rm{35}}\,\,{\rm{min}}

    D

    30  min{\rm{30}}\,\,{\rm{min}}

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Heat transfer, Electrical resistance, Series circuits, Power

    4.

    Two bulbs when connected in parallel to a source take 100W{\rm{100 W}} each. The total power consumed when they are connected in series with the same source isΒ 

    A

    25W{\rm{25 W}}

    B

    50W{\rm{50 W}}

    C

    100W{\rm{100 W}}

    D

    200W{\rm{200 W}}

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Power, Parallel circuits, Series circuits, Resistance

    5.

    Three electric bulbs of rating 60  W60\,\,W each are joined in series and then connected to electric mains. The power consumed by these three bulbs will be

    A

    180  W180\,\,W

    B

    60  W60\,\,W

    C

    20  W20\,\,W

    D

    203  W\frac{{20}}{3}\,\,W

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Power, Series circuits, Resistance

    6.

    Two electric bulbs have ratings respectively of 25  W,220  V{\rm{25}}\,\,{\rm{W, 220}}\,\,{\rm{V}} and 100  W,220  V{\rm{100}}\,\,{\rm{W, 220}}\,\,{\rm{V}}. If the bulbs are connected in series with a supply of 440{\rm{440}}, which bulb will fuse?

    A

    \begin{array}{*{20}{l}} {{\rm{25}}\,\,{\rm{W\,\, bulb}}} \end{array}

    B

    \begin{array}{*{20}{l}} {{\rm{100}}\,\,{\rm{W\,\, bulb}}} \end{array}

    C

    Both of these

    D

    None of these

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Power, Resistance, Series circuits, Voltage distribution

    7.

    There are two electric bulbs of 40  W40\,\,W and 100  W100\,\,W. Which one will be brighter when first connected in series and then in parallel

    A

    40  W40\,\,W in series and 100  W100\,\,W in parallel

    B

    100  W100\,\,W in series and 40  W40\,\,W in parallel

    C

    40  W40\,\,W both in series and parallel will be uniform

    D

    100  W100\,\,W both in series and parallel will be uniform

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Power, Series circuits, Parallel circuits, Resistance

    8.

    The main supply voltage to a room is 120  V{\rm{120}}\,\,{\rm{V}}. The resistance of the lead wires is 6  Ω{\rm{6}}\,\,{\rm{\Omega }}. A 60  W{\rm{60}}\,\,{\rm{W}} bulb is already giving light. What is the decrease in voltage across the bulb when a 240  W{\rm{240}}\,\,{\rm{W}} heater is switched on?

    A

    No change

    B

    \begin{array}{*{20}{l}} {{\rm{10}}\,\,{\rm{V}}} \end{array}

    C

    \begin{array}{*{20}{l}} {{\rm{20}}\,\,{\rm{V}}} \end{array}

    D

    More than 1\begin{array}{*{20}{l}} {{\rm{10}}\,\,{\rm{V}}} \end{array}

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Power, Resistance, Voltage, Ohm's Law, Series Circuits

    9.

    Two bulbs of 250  V{\rm{250}}\,\,{\rm{V}} and 100  W{\rm{100}}\,\,{\rm{W}} are first connected in series and then in parallel with a supply of 250  V{\rm{250}}\,\,{\rm{V}}. Total power in each of the case will be respectively

    A

    $\begin{array}{*{20}{l}}

    {{\rm{100 }},{\rm{W, 50 }},{\rm{W}}}

    \end{array}$

    B

    $\begin{array}{*{20}{l}}

    {{\rm{50 }},{\rm{W, 100 }},{\rm{W}}}

    \end{array}$

    C

    $\begin{array}{*{20}{l}}

    {{\rm{200 }},{\rm{W, 150 }},{\rm{W}}}

    \end{array}$

    D

    $\begin{array}{*{20}{l}}

    {{\rm{50 }},{\rm{W, 200 }},{\rm{W}}}

    \end{array}$

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Electrical power, Series circuits, Parallel circuits, Resistance

    10.

    A 25W,220V25W,220V bulb and a 100W,220V100W,220V bulb are connected in series across 440V440V line

    A

    only 100W100W bulb will fuse

    B

    only 25W25W bulb will fuse

    C

    none of the bub will fuse

    D

    both bulbs will fuse

    Question Tags
    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Power And Joules Law
    πŸŽ“ Ncert Level:Analyzing
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Power, Resistance, Ohm's Law, Series Circuits

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