question_answer2)
A bulb in an electric circuit is glowing. Is it a closed
or open electric circuit?
question_answer9)
What happens to the resistance as the conductor is made
thicker?
question_answer10)
What do the following symbols mean in circuit diagram?
(a) (b)
question_answer11)
The figure shows three resistors.
Find the combined resistance.
question_answer12)
What happens to the other bulbs in a series circuit if one
bulb blows off?
question_answer13)
What are the important effects of electric current?
question_answer15)
How can an ammeter be converted into a voltmeter?
question_answer18)
Find the minimum resistance that can be made using five
resistors, each of 
.
question_answer19)
Why does an ammeter have negligible resistance?
question_answer20)
What causes the potential difference between the two
terminals of a cell?
question_answer22)
Give two examples for application of heating effect of
electric current.
question_answer23)
Name and define the smallest commercial unit of
electricity.
question_answer24)
In how much time will a bulb of 100 W consume an energy of
2 kWh?
question_answer25)
What do you understand by the term fuse in an electric
circuit?
question_answer26)
What do the following circuit symbols represent?
(a) (b) 
question_answer27)
Write the symbols used in electric circuits to represent
(a) 
(b) 
question_answer28)
Write one function of the given symbol.
question_answer29)
Why closed path is required for the flow of current?
question_answer31)
List any two important properties of electric charge.
question_answer32)
Suggest any two smaller units of current.
question_answer33)
What is the resistance of air gap?
question_answer37)
Nichrome is used to make the element of electric heater.
Why?
question_answer38)
Why do we use copper and aluminium wires for transmission
of electric current?
question_answer39)
Alloys are used in electrical heating devices rather than
pure metals. Why?
question_answer43)
How does the resistance of an ohmic conductor depend on
the applied voltage?
question_answer45)
Draw a circuit diagram to show experimental set up for verification of Ohm's
law.
question_answer48)
Why does the chord of an electric heater not glow while the heating
element does?
question_answer62)
What does quantisation of charge mean?
question_answer63)
Define resistivity and state its SI unit.
question_answer64)
Find the equivalent resistance in the following circuit
question_answer77)
Find the total resistance between the points A and C in
the given circuit shown.
question_answer78)
Find the equivalent resistance of the following circuit
question_answer100)
State and verify Ohm's law.
question_answer101)
Explain briefly how the factors on which resistance of a
conductor depends.
question_answer102)
How can you show that we prefer parallel circuit?
question_answer105)
Define the unit of
electric current. [NCERT]
question_answer106)
Name a device that
helps to maintain a potential difference across a conductor.
question_answer109)
What determines the
rate at which energy is delivered by a current? [NCERT]
question_answer111)
Why is resistance
less when resistors are joined in parallel?
question_answer112)
Why is resistance
more in series combination?
question_answer113)
What are the
special features of a heating wire?
question_answer114)
What is the
resistance of an ideal ammeter?
question_answer115)
What is the
resistance of an ideal voltmeter?
question_answer118)
Name the physical quantity
whose unit is J/C.
question_answer119)
What is the
resistance of an air gap?
question_answer120)
What is the
commercial unit of electric energy?
question_answer121)
What happens to the
resistance of a wire if it is made thinner?
question_answer122)
In series
combination which remains constant?current or voltage?
question_answer123)
Which substance is
used for making resistance coil of electric heater and why?
question_answer125)
How is the ammeter
connected in the circuit?
question_answer126)
Why is an ammeter
connected in series in an electric circuit?
question_answer127)
Name two devices in
which electricity is converted into heat.
question_answer128)
Name the alloy
which is used for making the filament of bulbs.
question_answer129)
Name the instrument
used for measuring potential difference.
question_answer145)
On what factors
does the resistance of a conductor depend? [NCERT]
question_answer151)
What would be the
reading of ammeter and voltmeter in the given circuit?
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What is the value of the resistance of
the resistor?
V-I Draw a circuit diagram to show
The Plan
Decide which resistances are in series and parallel. Solve for series and
then for parallel. Combine both the results to get the equivalent resistance.
Which of the graph is/are correctly labelled in terms of
the words series and parallel? Justify your answer .
Calculate
(a) current through each resistor.
(b) the total current in the circuit.
(c) the total effective resistance of the circuit.
(a) State the type of combination of the two resistors in
the circuit.
(b) How much current is flowing through
(i) 
How will the brightness of glow of bulbs P and Q will
change? Justify your answer.
What is the value of
(a) current through 
On the basis of above passage, answer the following questions
(a) What changes were made by Vishesh?
(b) What would be the findings in the first circuit made
by Shamit indicate?
(c) What qualities of Vishesh are reflected from this?
(ii) 
(c) An electric circuit consisting of a 0.5 m long
nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug
key was set up.
(i)Draw the electric circuit diagram to study the relation
between the potential difference maintained between the points X and Y and the
electric current flowing through XY.
(ii) Following graph was plotted between V and I values
using above circuit
What would be the values of 
(a)What happens to the glow of the other two bulbs when
bulb 
(b) You have four resistors of 
