Electricity class 10 NCERT solutions will not only help in board exam preparation but also helps in clearing the competitive exams like Engineering. Also, candidates can find electricity class 10 numericals with solutions which helps candidates solving their assignments. Question 1 What does an electric circuit mean? Answer: A continuous and closed path along which an electric current flows is called an electric circuit.
Question 2 Define the unit of current. Answer: Unit of current is ampere. If one coulomb of charge flows through any section of a conductor in one second then the current through it is said to be one ampere. Question 3 Class 10th Ncert 2.2 And Calculate the number of electrons constituting one coulomb of charge. Question 1 Name a device that helps to maintain a potential difference across a conductor. Answer: A battery. Question 2 What is meant by saying that the potential difference between two points is IV?
Answer: The potential difference between two points is said to be 1 volt if 1 joule of work is done in moving 1 coulomb of electric charge from one point to the other. Question 3 How much energy is given to each coulomb of charge passing through a 6 V battery?
Question 1 On what factors does the resistance of a conductor depend? OR List the factors on which the resistance of a conductor in the shape of a wire depends. Question 2 Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Answer: The current will flow more easily through a thick wire than a thin wire of the same material.
Larger the area of cross-section of a conductor, more is the ease with which the electrons can move through the conductor.
Therefore, smaller is the resistance of the conductor. Question 3 Let the resistance of an electrical component remains 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? Answer: When potential difference is halved, the current through the component also decreases to half of its initial value.
Question 4 Why are coils of electric toasters and electric irons are made of an-alloy rather than a pure metal? OR Why are alloys commonly used in electric heating devices? Given reason.
Question 5 Use the data in Table Thus iron is a better conductor because it has lower resistivity than mercury. Answer: The required circuit diagram is shown below :. What would be the readings in the ammeter and the voltmeter?
Solution: The required circuit diagram is shown on the right. Answer: When the resistances are connected in parallel, the equivalent resistance is smaller than the smallest individual resistance. 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? Question 3 What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?
Answer: Advantages of connecting electrical devices in parallel with the battery are :. Solution: i Highest resistance can be obtained by connecting the four coils in series.
Question 1 Why does the cord of an electric heater not glow while the heating element does? Solution: Heat generated in a circuit is given by I 2 R t. The heating element of an electric heater made of nichrome glows because it becomes red-hot due to the large amount of heat produced on passing current because of its high resistance, but the cord of the electric heater made of copper does not glow because negligible heat is produced in it by passing current because of its extremely low resistance.
Question 2 Compute the heat generated while transferring coulomb of charge in one hour through a potential difference of 50 V. Calculate the heat developed in 30 s. Question 1 What determines the rate at which energy is delivered by a current? Answer: Resistance of the circuit determines the rate at which energy is delivered by a current. Question 2 An electric motor takes 5 A from a V line. Determine the power of the motor and the energy consumed in 2 h.
Question 1 A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. Question 2 Which of the following terms does not represent electrical power in a circuit?
Question 3 An electric bulb is rated V and W. Question 4 Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be : a 1 : 2 b 2 : 1 c 1 : 4 d 4 : 1 Answer: c 1 : 4.
Question 5 How is a voltmeter connected in the circuit to measure the potential difference between two points? Answer: A voltmeter is connected in parallel to measure the potential difference between two points. Question 6 A copper wire has diameter 0. How much does the resistance change if the diameter is doubled?
Answer: If a wire of diameter doubled to it is taken, then area of cross-section becomes four times. Question 7 The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below : Plot a graph between V and I and calculate the resistance of the resistor. Solution: The graph between V and I for the above data is given below.
The slope of the graph will give the value of resistance. Let us consider two points P and Q on the graph. Question 8 When a 12 V battery is connected across an unknown resistor, there is a current of 2. Find the value of the resistance of the resistor. Question 9 A battery of 9V is connected in series with resistors of 0. How much current would flow through the 12 Q resistor? Thus 4 resistors are needed to be connect. The equivalent resistance is.
Question 12 Several electric bulbs designed to be used on a V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of V line if the maximum allowable current is 5 A? What are the currents in the three cases? Solution: i When the two coils A and B are used separately.
Solution: i The circuit diagram is shown in figure. Question 15 Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is V? Calculate the rate at which heat is developed in the heater. Question 18 Explain the following: i Why is tungsten used almost exclusively for filament of electric lamps?
If the area of cross section of a conductor of fixed length is increased, then resistance decreases because there are more free electrons for movement in Class 10th Ncert 2.2 Limited conductor. So, they do not become too hot on passing electric current. Electric current, potential difference and electric current, Ohms law, Resistance, Resistivity factors on which the resistance of a conductor depends; Series combination of resistors, parallel combination of resistors; and its application on daily life; Heating effect of Electric current, electric Power, Interrelation between P, V, and R.
Formulae Handbook for Class 10 Maths and Science. Page What does an electric circuit mean? Electric circuit is a continuous and closed path made of conducting wires, through which the electric current flows. It comprises a cell, ammeter, voltmeter, plug key, etc. Define the unit of current. SI unit of electric current is ampere A.
Ampere is the flow of electric charges through an area at the rate of one coulomb per second, i. Question 1: Name a device that helps to maintain a potential difference across a conductor. Answer: Cell or battery eliminator. Question 2: What is meant by saying that the potential difference between two points is 1 V? Question 3: How much energy is given to one coulomb of charge passing through a 6 V battery Answer:.
Question 1: On what factors does the resistance of a conductor depend Answer: Resistance of a conductor depends upon: i Resistivity of the material. Question 2: Will current flow more easily through a thick wire or thin wire of the same material when connected to the same source? Question 3: Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. Answer: Hence, the current through an electrical component also becomes half of its previous value.
Question 4: Why are the coils of electric toasters and electric irons made of an alloy rather than a pure metal Answer: The coils of electric toaster and electric iron are made of an alloy rather than a pure metal because of the following reasons; i The resistivity of an alloy is higher than that of a pure metal.
Question 5: Use the data in Table Question 2: Redraw the circuit of the above question, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the voltage across the 12 resistor.
What would be the reading in the ammeter and the voltmeter? Question 1: Judge the equivalent resistance when the following are connected in parallel.
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 flows through it? Question 3: What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?
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