Zeeshanmahdi#16
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Chapter # 16
CURRENT ELECTRICITY Q#1: Choose the correct answer of the statement from the given choices I. (a) (b) (c) (d) II. (a) (b) (c) (d) III. (a) (b) (c) (d) IV. (a) (b) (c) (d) V. (a) (b) (c) (d) VI. (a) (b) (c) (d) VII. (a) (b) (c) (d) VIII. (a) (b) (c) (d) IX. (a) (b) (c) (d) X.
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(a) (b) (c) (d) XI. (a) (b) (c) (d) XII. (a) (b) (c) (d) XIII. (a) (b) (c) (d) XIV. (a) (b) (c) (d) XV. (a) (b) (c) (d) XVI. (a) (b) (c) (d) XVII. (a) (b) (c) (d) XVIII. (a) (b) (c) (d) XIX. (a) (b) (c) (d) XX. (a) (b) (c) (d) XXI. (a) (b) (c) (d) XXII.
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(a) (b) (c) (d) XXIII. (a) (b) (c) (d) XXIV. (a) (b) (c) (d)
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Q#2: Give short answer of the following questions I.
Define electric current?
Ans: The rate of flow of electric charges through any cross-sectional area is known as the electric current. II.
Define conventional current? Ans: The current due to the flow of positive charge carries, equivalent to negative but opposite to the direction is called conventional current.
III.
Define emf? Ans: The amount of energy supplied by the battery in pushing one coulomb of charge (electron) from its positive terminal to the negative terminal through the battery is known as the Electro-Motive Force (emf).
IV.
Emf stands for?
Ans: Emf stands for Electro-Motive Force. V.
Define potential difference?
Ans: Thus potential difference between two points can be defined as the energy supplied by a unit charge as it moves from one point to the other in an electric field. VI.
Write the equation of electric current?
Ans: The equation of electric charge is defined as VII.
I= Q /t
Which current is considered in normal circuit analysis?
Ans: In normal analysis of circuits conventional current is to be considered. VIII.
Where does emf exist?
Ans: Normally Emf exist in the battery of the circuit. IX.
State ohm’s law?
Ans: The value of current ‘I’ passing through a conductor is directly proportional to the potential difference ‘V’ applied across its ends, providing the temperature and the physical state of the conductor does not change.
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X.
Write the limitations of ohm’s law?
Ans: Ohm’s law is applicable only in case of metallic conductors when their temperature and physical state does not change. XI.
Define ohmic and non-ohmic materials?
Ans: The materials which obey Ohm’s law are called Ohmic conductors, while the materials which do not obey Ohm’s law are called non-Ohmic materials. XII.
Define resistance?
Ans: The Property of a substance which opposes the flow of current through it is called its resistance. XIII.
Define unit of resistance?
Ans: The unit of resistance is Ohm. Ohm is usually represented by Greek letter . And it is defined as “ if one ampere current passes through a conductor when a potential difference of one volt is applied across its ends then the resistance of that is one ampere”. XIV.
What will be value of resistance if 5A current flows between potential differences of 20V?
Ans: As we have R = V/I =20/5 =4 XV.
On which factors specific resistance depends?
Ans: The specific resistance of a material depends upon the following factors Length of the material Area of cross- section of the material Nature of the material XVI.
When the specific resistance is equal to the resistance?
Ans: if the area of cross-section and the length of the conductor are equal to one then the specific resistance of that conductor is equal to its resistance. XVII.
Write down the relation of resistance and specific resistance?
Ans: The relation of specific resistance and resistance is as
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XVIII.
Define the unit of specific resistance?
Ans: The unit of specific heat is ohm meter, which could be defined as if a conductor of one meter having a resistance of one coulomb then its specific resistance is one ohm-meter. XIX.
What is the effect of temperature upon the resistance?
Ans: Due the increase in temperature the resistance of every material increases and resistance will decrease due to the decrease in temperature so we can also state that the temperature affects the resistance directly. XX.
Write the relation to represent the effect of temperature upon resistance? Ans: R-R = R x t
XXI.
Explain the construction of resistance thermometer?
XXII.
Explain the working of resistance thermometer?
XXIII.
Explain the series combination of resistances?
XXIV.
Explain the parallel combination of resistances?
XXV.
Write the characteristics of series combination of resistances?
XXVI.
Write the characteristics of parallel combination of resistances?
XXVII.
Write the equation of equivalent resistance for a series combination of resistances?
XXVIII.
Write the equation of equivalent resistance for a parallel combination of resistances?
XXIX.
In which combination resistance reduces?
XXX.
In which combination resistance increases?
XXXI.
Why we use galvanometer?
XXXII.
Why we use ammeter?
XXXIII.
Why we use voltmeter?
XXXIV.
How we connect galvanometer in circuit?
XXXV.
How we connect ammeter in circuit?
XXXVI.
How we connect voltmeter in circuit?
XXXVII.
What is the difference in Galvanometer and Ammeter?
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XXXVIII. XXXIX.
Write the advantage of low shunt resistance? How we connect the shunt resistance with the galvanometer?
XL.
What are the precautions to use galvanometer?
XLI.
What are the precautions to use ammeter?
XLII.
What are the precautions to use voltmeter?
XLIII.
What happens to the reading of voltmeter by increasing resistance?
XLIV.
Write the equation of joule’s law?
XLV.
State joule’s law?
XLVI.
Define electric power?
XLVII.
Write the unit of electric energy?
XLVIII.
Define the unit of electric energy?
XLIX.
Define alternating current?
L.
Define direct current?
LI.
What is the function of fuse and how it works?
LII.
What are the advantages of circuit breaker?
LIII.
What is the principle of circuit breaker?
LIV.
What are the advantages of using earth wire?
LV.
Why we call earth wire so?
LVI.
How earth wire works?
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Long Questions Q#3: explain conventional current, and conditions for the flow of current? Q#4: (a) express the relation between resistance and the specific resistance. (b) Explain the effect of temperature upon resistance and express in an equation. Q#5: Write different combinations of resistances and explain parallel combination? Q#6: Write a note on Galvanometer and explain the method to convert it into an ammeter and voltmeter? Q#7: (a) state joule’s law and express the relation of energy? (b) Define electrical power and express it in the form of equation. Q#8: (a) what is the advantage of earth wire and that of fuse? (b) Differentiate DC and AC current also explain electricity hazards.
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CURRENT ELECTRICITY Q#1: Choose the correct answer of the statement from the given choices I. (a) (b) (c) (d) II. (a) (b) (c) (d) III. (a) (b) (c) (d) IV. (a) (b) (c) (d) V. (a) (b) (c) (d) VI. (a) (b) (c) (d) VII. (a) (b) (c) (d) VIII. (a) (b) (c) (d) IX. (a) (b) (c) (d) X.
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(a) (b) (c) (d) XI. (a) (b) (c) (d) XII. (a) (b) (c) (d) XIII. (a) (b) (c) (d) XIV. (a) (b) (c) (d) XV. (a) (b) (c) (d) XVI. (a) (b) (c) (d) XVII. (a) (b) (c) (d) XVIII. (a) (b) (c) (d) XIX. (a) (b) (c) (d) XX. (a) (b) (c) (d) XXI. (a) (b) (c) (d) XXII.
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(a) (b) (c) (d) XXIII. (a) (b) (c) (d) XXIV. (a) (b) (c) (d)
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Q#2: Give short answer of the following questions I.
Define electric current?
Ans: The rate of flow of electric charges through any cross-sectional area is known as the electric current. II.
Define conventional current? Ans: The current due to the flow of positive charge carries, equivalent to negative but opposite to the direction is called conventional current.
III.
Define emf? Ans: The amount of energy supplied by the battery in pushing one coulomb of charge (electron) from its positive terminal to the negative terminal through the battery is known as the Electro-Motive Force (emf).
IV.
Emf stands for?
Ans: Emf stands for Electro-Motive Force. V.
Define potential difference?
Ans: Thus potential difference between two points can be defined as the energy supplied by a unit charge as it moves from one point to the other in an electric field. VI.
Write the equation of electric current?
Ans: The equation of electric charge is defined as VII.
I= Q /t
Which current is considered in normal circuit analysis?
Ans: In normal analysis of circuits conventional current is to be considered. VIII.
Where does emf exist?
Ans: Normally Emf exist in the battery of the circuit. IX.
State ohm’s law?
Ans: The value of current ‘I’ passing through a conductor is directly proportional to the potential difference ‘V’ applied across its ends, providing the temperature and the physical state of the conductor does not change.
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X.
Write the limitations of ohm’s law?
Ans: Ohm’s law is applicable only in case of metallic conductors when their temperature and physical state does not change. XI.
Define ohmic and non-ohmic materials?
Ans: The materials which obey Ohm’s law are called Ohmic conductors, while the materials which do not obey Ohm’s law are called non-Ohmic materials. XII.
Define resistance?
Ans: The Property of a substance which opposes the flow of current through it is called its resistance. XIII.
Define unit of resistance?
Ans: The unit of resistance is Ohm. Ohm is usually represented by Greek letter . And it is defined as “ if one ampere current passes through a conductor when a potential difference of one volt is applied across its ends then the resistance of that is one ampere”. XIV.
What will be value of resistance if 5A current flows between potential differences of 20V?
Ans: As we have R = V/I =20/5 =4 XV.
On which factors specific resistance depends?
Ans: The specific resistance of a material depends upon the following factors Length of the material Area of cross- section of the material Nature of the material XVI.
When the specific resistance is equal to the resistance?
Ans: if the area of cross-section and the length of the conductor are equal to one then the specific resistance of that conductor is equal to its resistance. XVII.
Write down the relation of resistance and specific resistance?
Ans: The relation of specific resistance and resistance is as
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R= L/A
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XVIII.
Define the unit of specific resistance?
Ans: The unit of specific heat is ohm meter, which could be defined as if a conductor of one meter having a resistance of one coulomb then its specific resistance is one ohm-meter. XIX.
What is the effect of temperature upon the resistance?
Ans: Due the increase in temperature the resistance of every material increases and resistance will decrease due to the decrease in temperature so we can also state that the temperature affects the resistance directly. XX.
Write the relation to represent the effect of temperature upon resistance? Ans: R-R = R x t
XXI.
Explain the construction of resistance thermometer?
XXII.
Explain the working of resistance thermometer?
XXIII.
Explain the series combination of resistances?
XXIV.
Explain the parallel combination of resistances?
XXV.
Write the characteristics of series combination of resistances?
XXVI.
Write the characteristics of parallel combination of resistances?
XXVII.
Write the equation of equivalent resistance for a series combination of resistances?
XXVIII.
Write the equation of equivalent resistance for a parallel combination of resistances?
XXIX.
In which combination resistance reduces?
XXX.
In which combination resistance increases?
XXXI.
Why we use galvanometer?
XXXII.
Why we use ammeter?
XXXIII.
Why we use voltmeter?
XXXIV.
How we connect galvanometer in circuit?
XXXV.
How we connect ammeter in circuit?
XXXVI.
How we connect voltmeter in circuit?
XXXVII.
What is the difference in Galvanometer and Ammeter?
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XXXVIII. XXXIX.
Write the advantage of low shunt resistance? How we connect the shunt resistance with the galvanometer?
XL.
What are the precautions to use galvanometer?
XLI.
What are the precautions to use ammeter?
XLII.
What are the precautions to use voltmeter?
XLIII.
What happens to the reading of voltmeter by increasing resistance?
XLIV.
Write the equation of joule’s law?
XLV.
State joule’s law?
XLVI.
Define electric power?
XLVII.
Write the unit of electric energy?
XLVIII.
Define the unit of electric energy?
XLIX.
Define alternating current?
L.
Define direct current?
LI.
What is the function of fuse and how it works?
LII.
What are the advantages of circuit breaker?
LIII.
What is the principle of circuit breaker?
LIV.
What are the advantages of using earth wire?
LV.
Why we call earth wire so?
LVI.
How earth wire works?
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Long Questions Q#3: explain conventional current, and conditions for the flow of current? Q#4: (a) express the relation between resistance and the specific resistance. (b) Explain the effect of temperature upon resistance and express in an equation. Q#5: Write different combinations of resistances and explain parallel combination? Q#6: Write a note on Galvanometer and explain the method to convert it into an ammeter and voltmeter? Q#7: (a) state joule’s law and express the relation of energy? (b) Define electrical power and express it in the form of equation. Q#8: (a) what is the advantage of earth wire and that of fuse? (b) Differentiate DC and AC current also explain electricity hazards.
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