Current Electricity Exercise 9a
Please Select
Q1 Name one d.c. source and one a.c. source.
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Q2 Distinguish between d.c. and a.c.
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Q3 What is an electric cell?
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Q4 What transformation of energy takes place when current is drawn from a cell?
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Q5 Name the constituents of a cell.
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Q6 State the two kinds of cell. Give one example of each.
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Q7 What is a primary cell? Name two such cells.
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Q8 What is a secondary cell? Name one such cell.
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Q9 State three differences between primary and secondary cells.
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Q10 What do you understand by the term current? State and define it's S.I. unit.
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Q11 How much is the charge of an electron?
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Q12 n electrons flow through a cross section of a conductor in time t. If charge on an electron is e, write an expression for the current in the conductor.
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Q13 Name the instrument used to control current in an electric circuit.
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Q14 In the electric circuit shown in the figure below, label the parts A, B, C, D, E, and F. State the function of each part. Show in the diagram the direction of flow of current.
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Q15 What is the function of a key (or switch) in an electric circuit?
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Q16 Write symbols and state functions of each of the following components in an electric circuit —
(i) key
(ii) cell
(iii) rheostat
(iv) ammeter
(v) voltmeter
Solution :
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Q17 (a) Complete the circuit given in figure by inserting between the terminals A and C, an ammeter. (b) In the diagram mark the polarity at the terminals of ammeter and indicate clearly the direction of flow of current in the circuit, when the circuit is complete. (c) Name and state the purpose of Rh in the circuit.
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Q18 What are conductors and insulators of electricity? Give two examples of each.
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Q19 Select conductors of electricity from the following — Copper wire, silk thread, pure water, acidulated water, human body, glass, mercury.
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Q20 State two differences between a conductor and an insulator of electricity.
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Q21 Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagram.
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Q22 Write the condition required for a circuit to be a closed circuit.
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Multiple Choice Questions
Q1 A cell is used to:
(a) measure current in a circuit
(b) provide current in a circuit
(c) limit current in a circuit
(d) prevent current in a circuit
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Q2 The unit of current is:
(a) ampere
(b) volt
(c) ohm
(d) coulomb
Solution :
Q3 The insulator of electricity is:
(a) copper
(b) acidulated water
(c) human body
(d) silk
Solution :
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