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Current Electricity Exe-9A Short Answer Type
Concise Physics Class-9 ICSE Selina Publishers
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Exercise- 9A Electric Current
Current Electricity Short Answer Physics Class-9 ICSE Selina Publishers
Page – 215
SHORT ANSWER TYPE:
Question-1 What is a primary cell? Name two such cells.
Answer-1 The cells from which the electric energy is derived from an irreversible chemical reaction are called primary cells.
Two examples of primary cells are:
1=>Daniel cell, and
Question-2 What is a secondary cell? Name one such cell.
Answer-2 The cells from which the electric energy is derived from the reversible chemical reaction are called secondary cells. An Example of secondary cell => a lead-acid accumulator.
Question-3 What do you understand by the term current ? State and define its S.I. unit.
Answer-3 Current is the rate of flow of charge across a cross-section. It is a scalar quantity. Its S.I. unit is ampere (coulomb per second). If 1 ampere current flows through a conductor, it means that 6.25 x 1018 electrons pass in 1 second across that cross-section of conductor.
Question-4 What are conductors and insulators of electricity ? Give two examples of each.
Answer-4 Conductors are those substances through which electricity can flow are called conductors. Some common conductors are copper, aluminum, gold, and silver. Insulators are those substances through which electricity cannot flow are called insulators. Some common insulators are glass, plastic, rubber, and wood.
Question-5 State two differences between a conductor and an insulator of electricity.
Answer-5 Conductors have a large number of free electrons and they offer a very small resistance in the path of current but insulators have no free electrons and they offer a very high resistance in the path of current.
Question-6 Write the condition required for a circuit to be a closed circuit.
Answer-6 The condition required for a circuit to be a closed circuit every part of the circuit must be made of conductors. If the key is present it must be connected to make a circuit a closed circuit.
Question-7 How will you obtain a source of large direct current ? Show it with the help of a diagram.
Answer-7 When a strong direct current is needed, either we join a number of cells together in series (cathode of one cell connected to the anode of another cell), to form a battery or we use a storage cell.
Question-8 Which material is used to make wires for a resistance box? Why is this particular material used?
Answer-8 Manganin is used in making the resistance coils as its temperature coefficient is least. due to less temperature coefficient of Manganin there is no appreciable change in resistance with temperature.Hence it is best material to use for making of resistance boxes.
Question-9 A galvanometer has an ‘O’ mark at the middle, while a voltmeter and ammeter has the mark at the left hand corner of the dial. Explain.
Answer-9 A galvanometer has O at centre to show direction of current whereas ammeter and voltmeter shows O at an end as they do not show the Direction in which current is flowing.
Question-10 What is meant by load in an electrical circuit ? Give some examples.
Answer-10 An electrical load is simply any component of a circuit that consumes power and energy. In a household setting, the most obvious examples of electrical loads include light bulbs and appliances.
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