question_answer2) A bulb in an electric circuit is glowing. Is it a closed or open electric circuit?
View Solution play_arrowquestion_answer9) What happens to the resistance as the conductor is made thicker?
View Solution play_arrowquestion_answer10) What do the following symbols mean in circuit diagram? (a) (b)
View Solution play_arrowquestion_answer11) The figure shows three resistors. Find the combined resistance.
View Solution play_arrowquestion_answer12) What happens to the other bulbs in a series circuit if one bulb blows off?
View Solution play_arrowquestion_answer13) What are the important effects of electric current?
View Solution play_arrowquestion_answer15) How can an ammeter be converted into a voltmeter?
View Solution play_arrowquestion_answer18) Find the minimum resistance that can be made using five resistors, each of .
View Solution play_arrowquestion_answer19) Why does an ammeter have negligible resistance?
View Solution play_arrowquestion_answer20) What causes the potential difference between the two terminals of a cell?
View Solution play_arrowquestion_answer22) Give two examples for application of heating effect of electric current.
View Solution play_arrowquestion_answer23) Name and define the smallest commercial unit of electricity.
View Solution play_arrowquestion_answer24) In how much time will a bulb of 100 W consume an energy of 2 kWh?
View Solution play_arrowquestion_answer25) What do you understand by the term fuse in an electric circuit?
View Solution play_arrowquestion_answer26) What do the following circuit symbols represent? (a) (b)
View Solution play_arrowquestion_answer27) Write the symbols used in electric circuits to represent (a) (b)
View Solution play_arrowquestion_answer28) Write one function of the given symbol.
View Solution play_arrowquestion_answer29) Why closed path is required for the flow of current?
View Solution play_arrowquestion_answer31) List any two important properties of electric charge.
View Solution play_arrowquestion_answer32) Suggest any two smaller units of current.
View Solution play_arrowquestion_answer33) What is the resistance of air gap?
View Solution play_arrowquestion_answer37) Nichrome is used to make the element of electric heater. Why?
View Solution play_arrowquestion_answer38) Why do we use copper and aluminium wires for transmission of electric current?
View Solution play_arrowquestion_answer39) Alloys are used in electrical heating devices rather than pure metals. Why?
View Solution play_arrowquestion_answer43) How does the resistance of an ohmic conductor depend on the applied voltage?
View Solution play_arrowquestion_answer45) Draw a circuit diagram to show experimental set up for verification of Ohm's law.
View Solution play_arrowquestion_answer48) Why does the chord of an electric heater not glow while the heating element does?
View Solution play_arrowquestion_answer51) Following table gives the resistivity of three samples in m
Sample | A | B | C |
Resistivity |
question_answer62) What does quantisation of charge mean?
View Solution play_arrowquestion_answer63) Define resistivity and state its SI unit.
View Solution play_arrowquestion_answer64) Find the equivalent resistance in the following circuit
View Solution play_arrowWire | Length | Diameter | Materials | Resistances |
A | 2d | Aluminium | ||
B | d/2 | Constantan | ||
C | d/2 | Constantan | ||
D | 3d | Copper | ||
E | 2d | Aluminium | ||
F | 4d | Copper |
question_answer77) Find the total resistance between the points A and C in the given circuit shown.
View Solution play_arrowquestion_answer78) Find the equivalent resistance of the following circuit
View Solution play_arrowquestion_answer100) State and verify Ohm's law.
View Solution play_arrowquestion_answer101) Explain briefly how the factors on which resistance of a conductor depends.
View Solution play_arrowquestion_answer102) How can you show that we prefer parallel circuit?
View Solution play_arrowquestion_answer105) Define the unit of electric current. [NCERT]
View Solution play_arrowquestion_answer106) Name a device that helps to maintain a potential difference across a conductor.
View Solution play_arrowquestion_answer109) What determines the rate at which energy is delivered by a current? [NCERT]
View Solution play_arrowquestion_answer111) Why is resistance less when resistors are joined in parallel?
View Solution play_arrowquestion_answer112) Why is resistance more in series combination?
View Solution play_arrowquestion_answer113) What are the special features of a heating wire?
View Solution play_arrowquestion_answer114) What is the resistance of an ideal ammeter?
View Solution play_arrowquestion_answer115) What is the resistance of an ideal voltmeter?
View Solution play_arrowquestion_answer118) Name the physical quantity whose unit is J/C.
View Solution play_arrowquestion_answer119) What is the resistance of an air gap?
View Solution play_arrowquestion_answer120) What is the commercial unit of electric energy?
View Solution play_arrowquestion_answer121) What happens to the resistance of a wire if it is made thinner?
View Solution play_arrowquestion_answer122) In series combination which remains constant?current or voltage?
View Solution play_arrowquestion_answer123) Which substance is used for making resistance coil of electric heater and why?
View Solution play_arrowquestion_answer125) How is the ammeter connected in the circuit?
View Solution play_arrowquestion_answer126) Why is an ammeter connected in series in an electric circuit?
View Solution play_arrowquestion_answer127) Name two devices in which electricity is converted into heat.
View Solution play_arrowquestion_answer128) Name the alloy which is used for making the filament of bulbs.
View Solution play_arrowquestion_answer129) Name the instrument used for measuring potential difference.
View Solution play_arrowquestion_answer131) The following table gives the value of electrical resistivity of some materials
Material | Cooper | Silver | Constantan |
Electrical resistivity (in m) |
question_answer145) On what factors does the resistance of a conductor depend? [NCERT]
View Solution play_arrowquestion_answer151) What would be the reading of ammeter and voltmeter in the given circuit?
View Solution play_arrowWire | Length | Diameter | Material | Resistance |
A | Aluminium | R1 | ||
B | Constantan | R2 | ||
C | Constantan | r3 | ||
D | Copper | R4 | ||
E | Aluminium | r5 | ||
F | Copper | R6 |
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