1) Terminal potential/ EMF of a cell
B) ANSWER THE FOLLOWING:
1) Write an expression for the resistance of conducting wire in terms of it's length and area of cross section.
2) Which particles are responsible for the flow of current in conductor.
3) Is Electrostatic potential a scalar or vector quantity.
4) When is potential difference between two points said to be 1 volt.
5) How can we maintain a potential difference across a conductor.
6) Give a single word for 1joule/1 coulumb
7) In what direction do the positive charges flow under a given potential difference.
8) Under what conditions does the electric current flow ?
9) What is meant by 1 ohm resistance.
10) What will happen to the current flowing through a conductor if the potential difference is doubled.
11) When do we say that the resistors are connected in series.
12) When do we say that the resistors are connected in parallel?
13) What will happen to the current in a circuit if its
resistance is doubled.
14) What is the cause of resistance.
15) When do we connect resistors in parallel?
16) When do we connect resistance in series ?
17) How does the Resistivity of a
a) metallic wire
b) Semiconductor
c) an alloy such as constantan depend on temperature.
18) Which will have higher Resistivity; a conductor or an insulator.
19) What are ohmic conductor? Give an example. Draw a current-voltage graph for such a conductor.
20) What are the conditions under which Ohm's law is not obeyed ?
21) How does the resistance of a conductive wire depends on its length and area of cross section.
C) DEFINITION:
1) Ohm's law
2) Electrostatic potential at a point.
3) Potential difference
4) 1 volt
5) Electric current.
6) Resistance
7) Resistivity.
8) Equivalent resistance.
9) Ampere
10) E. M. F.
11) Internal resistance
D) FACTORS::
1) Internal resistance of a cell.
2) Resistance of a conductor
3) Resistivity of a material.
4) Give the statement of Ohm's law and list the factors, on which the resistance of a conductor, depends.
E) S. I unit of:
1) Electric potential
2) Resistance.
3) Resistivity
4) Current
5) Potential difference
F) REASON BEHIND:
1) Why there is an increase in the resistance, when two resistors are connected in series.
2) Why there is a decrease in the resistance, when two resistors are connected in parallel ?
3) Why series arrangement is not found satisfactory for house lights ?
4) Why is the resistance of a given wire inversely proportional to it's cross-sectional area ?
5)
G) TRUE/FALSE:
1) The quantity of charges flowing past a point multiplied by the time is current.
2) The Resistivity of all pure material increases with increase in tempreture.
3) Ohm's law is a relationship between the power used in a circuit to the current and the potential difference.
CURRENT ELECTRICITY
A) DEFINITION:
a) An electric current,
b) Ampere,
c) Potential Difference,
d) Ohms law,
e) Super conductor,
f) Resistance,
g) Resistivity or Specific resistance,
h) conductance,
i) Electromotive force,
j) Internal resistance,
B) S. I. UNIT
a) Current,
b) Potential difference,
c) Resistance,
d) Specific resistance,
e) Conductance,
C) FILL IN THE BLANKS.
1) Rate of flow of charge is called..
2) The flow of current is due to the motion of...
3) The work done in moving a positive charge across two points in an electric circuit is a measure of..
4) The current is... proportional to potential difference and ... proportional to resistance.
5) The combined resistance of any number of resistors connected in.. is equal to the sum of the individual resistors.
6) A cell converts .. energy into.. energy.
7) The specific resistance does not depend on the.. of a conductor.
8) E. M. F of a cell is potential difference in... circuit.
9) If n equal resistance are put in parallel, the total resistance is equal to...
10) Conductivity is ....of resistivity.
D) TRUE/FALSE: also correct the false statements :
1) Potential difference between two points is less than the work done in moving a unit positive charge from one point to the other.
2) The e.m.f. of a cell depends on the shape and the distance between the electrodes.
3) A good conductor of electicity offers more resistance.
4) The resistance of a wire decreases with the increase in its temperature.
5) It is advantageous to join cells in series only if the internal resistance of each cell is high enough compared to external resistance.
6) When the resistance of a circuit is to be increased, the resistance are joined in parallel and when a heavy current is to be passed, they are joined in series so as to decrease the total resistance.
E) Difference:
a) resistance/ specific resistance,
b) e.m.f/terminal voltage.
F) FACTORS/CONDITION:
a) resistivity of a wire,
b) Ohms law,
c) resistance of a conductor,
G) CHARACTERISTICS:
a) series circuit,
b) parallel circuit,
REASONS:
a) Why is an alloy manganin , Eureka used to make standard resistances?
b) The resistance of a wire depends on its length ?
c) why is not advisable to keep the cells connected in parallel when not in use.
d) why should the internal resistance of a cell be low ?
e) why the potential difference across the terminal of a cell is more in an open circuit and it is reduced in a closed circuit ?
QUESTIONS:
1) By what name is the physical quantity coulomb per second called
2) Is a wire carrying current charged
3) State whether electric current is a vector or a scalar quantity .
4) Is potential a vector or scalar quantity ?
5) what is meant by saying that potential at a point is 1 volt.
6) what are the factors on which the resistance of a conductor depends?
7) A wire is stretched to twice its original length. Is its resistance change or not? If yes, by what factors does its resistance change?
8) which will have higher resistivity, a conductor or an insulator ?
9) advantageous to connect cells
a) in series
b) in parallel
10) what are the limitations of Ohm's law ?
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