Current Electricity Exercise 9b
Please Select
Q1 Figure below shows two conductors A and B. Their charges and potentials are given in the diagram. State the direction of (i) flow of electrons, and (ii) flow of current, when both the conductors are joined by a metal wire.
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Q2 How is the direction of flow of current between two charged conductors determined by their potentials?
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Q3 Explain the concept of electric potential difference in terms of work done in transferring the charge.
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Q4 Define the term potential difference.
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Q5 State and define the S.I. unit of potential difference.
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Q6 'The potential difference between two conductors is 1 volt'. Explain the meaning of this statement.
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Q7 What do you understand by the term resistance?
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Q8 Explain why does a metal wire when connected to a cell offer resistance to the flow of current.
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Q9 State and define the S.I. unit of resistance.
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Q10 State Ohm's law.
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Q11 How are the potential difference (V), current (I) and resistance (R) related?
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Q12 'The resistance of wire is 1 ohm'. Explain the meaning of this statement.
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Q13 How is the current flowing in a conductor changed if the resistance of conductor is doubled keeping the potential difference across it the same?
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Q14 State three factors on which the resistance of a wire depends. Explain how does the resistance depend on the factors stated by you.
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Q15 How is the resistance of a wire affected if it's (a) length is doubled, (b) radius is doubled?
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Q16 State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.
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Q17 Name the physical quantities of which the units are —
(i) volt
(ii) coulomb
(iii) ohm
(iv) ampere
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Multiple Choice Questions
Q1 Current in a circuit flows:
(a) in direction from high potential to low potential
(b) in direction from low potential to high potential
(c) in direction of flow of electrons
(d) in any direction
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Q2 The unit of potential difference is:
(a)ampere
(b)volt
(c)ohm
(d)coulomb
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Q3 On increasing the resistance in a circuit, the current in it:
(a) decreases
(b)increases
(c)remains unchanged
(d)nothing can be said
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