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Answer :

A battery or a cell.

- What does an electric circuit mean?
- Define the unit of current.
- Calculate the number of electrons constituting one coulomb of charge.
- What is meant by saying that the potential difference between two points is 1V?
- How much energy is given to each coulomb of charge passing through a 6 V battery?
- On what factors does the resistance of a conductor depend ?
- Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source ? Why ?
- Let the resistance of an electrical component remain constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
- Why are coils of electric toasters and electric irons are made of an-alloy rather than a pure metal ?
- Use the data in Table 12.2 (in NCERT Book on Page No. 207) to answer the following : (i) Which among iron and mercury is a better conductor ? (ii) Which material is the best conductor ?
- Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 \(\Omega \) resistor, an 8 \(\Omega \) resistor, and a 12\(\Omega \) resistor, and a plug key, all connected in series.
- Redraw the circuit of Question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 \(\Omega \) resistor. What would be the readings in the ammeter and the voltmeter?
- Judge the equivalent resistance when the following are connected in parallel – (a) 1 \( \Omega \) and 106\( \Omega \), (b) 1\( \Omega \) and 103\( \Omega \), and 106\( \Omega \).
- An electric lamp of 100 \(\Omega \) , a toaster of resistance 50 \(\Omega \), and a water filter of resistance 500 \(\Omega \) are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it ?
- What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series ?
- How can three resistors of resistances 2\(\Omega \), 3\(\Omega \) , and 6\(\Omega \) be connected to give a total resistance of (a) 4\(\Omega \), (b) 1\(\Omega \)?
- What is (i) the highest, (ii) the lowest total resistance that can be secured by combinations of four coils of resistance 4\(\Omega \) , 8\(\Omega \), 12\(\Omega \), 24\(\Omega \) ?
- Why does the cord of an electric heater not glow while the heating element does ?
- Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.
- What determines the rate at which energy is delivered by a current ?
- An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

- NCERT solutions for class 10 maths chapter 1 Real Numbers
- NCERT solutions for class 10 maths chapter 1 Electricity, Light , Carbon and it's compounds
- NCERT solutions for class 10 maths chapter 2 Polynomials
- NCERT solutions for class 10 maths chapter 3 Pair of linear equations in two variables
- NCERT solutions for class 10 maths chapter 4 Quadratic Equations
- NCERT solutions for class 10 maths chapter 5 Arithmetic Progressions
- NCERT solutions for class 10 maths chapter 6 Triangles
- NCERT solutions for class 10 maths chapter 7 Coordinate Geometry
- NCERT solutions for class 10 maths chapter 8 Introduction to Trigonometry
- NCERT solutions for class 10 maths chapter 9 Some Applications of Trigonometry
- NCERT solutions for class 10 maths chapter 10 Circles
- NCERT solutions for class 10 maths chapter 11 Constructions
- NCERT solutions for class 10 maths chapter 12 Areas related to circles
- NCERT solutions for class 10 maths chapter 13 Surface Areas and Volumes
- NCERT solutions for class 10 maths chapter 14 Statistics
- NCERT solutions for class 10 maths chapter 15 Probability

- NCERT solutions for class 10 science chapter 1 Chemical Reactions and Equations
- NCERT solutions for class 10 science chapter 2 Acids, Bases and Salts
- NCERT solutions for class 10 science chapter 3 Metals and Non Metals
- NCERT solutions for class 10 science chapter 4 Carbon and its Compounds
- NCERT solutions for class 10 science chapter 5 Periodic Classification of Elements
- NCERT solutions for class 10 science chapter 6 Life Processes
- NCERT solutions for class 10 science chapter 7 Control and Coordination
- NCERT solutions for class 10 science chapter 8 How do Organisms Reproduce
- NCERT solutions for class 10 science chapter 9 Heredity and Evolution
- NCERT solutions for class 10 science chapter 10 Light Reflection and Refraction
- NCERT solutions for class 10 science chapter 11 Human Eye and Colorful World
- NCERT solutions for class 10 science chapter 12 Electricity
- NCERT solutions for class 10 science chapter 13 Magnetic Effect of Electric Current
- NCERT solutions for class 10 science chapter 14 Sources of Energy
- NCERT solutions for class 10 science chapter 15 Our Environment
- NCERT solutions for class 10 science chapter 16 Management of Natural Resources