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Resistance of each part is. Thus, option D is correct. Which of the following terms does not represent electrical power in a circuit? Pur , in equation 1,. P cannot be. Thus, option B is correct. An electric bulb is rated V and W. When it is operated on V, the power consumed will be. The resistance of the bulb. If bulb is operated on Vand resistance is the same , the power consumed will be P'. Hence, option D is correct. 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. If resistors are connected in parallel, the net resistance is given as. If resistors are connected in series, the net resistance is given as. Thus, option C is correct. How is a voltmeter connected in the circuit to measure the potential difference between two points? A voltmeter should be connected in parallel, to measure the potential difference between two points.
A copper wire has a diameter of 0. What will be the length of this wire to make its resistance? How much does the resistance change if the diameter is doubled? We know. If the diameter is doubled. Hence, new resistance is of original resistance. The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given be low �.
I amperes 0. Plot a graph between V and I and calculate the resistance of that resistor. The plot between voltage and current is as shown :.
The slope of the line gives resistance R. 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. A battery of 9 V is connected in series with resistors of , , , and respectively. How much current would flow through the resistor? Hence, All resistors are in series so 0. How many resistors in parallel are required to carry 5 A on a V line? Let x number of resistors are connected in parallel to obtain 44 Ohm equivalent resistance.
Hence, 4 resistors of Ohm are connected in parallel to obtain 44 Ohm. Show how you would connect three resistors, each of resistance , so that the combination has a resistance of i , ii.
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? Let x be the number of bulbs. For x bulbs of resistance Ohm, are connected in parallel to obtain 44 Ohm equivalent resistance.
Hence, bulbs of Ohm are connected in parallel to obtain 44 Ohm. A hot plate of an electric oven connected to a V line has two resistance coils A and B, each of resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
When coil is used separately,current in coil is. When two coils are connected in series, net resistance is. When two coils are connected in parallel, net resistance is. Compare the power used in the resistor in each of the following circuits:. In, a series current is constant. In, parallel combination voltage in the circuit is constant. Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to an electric mains supply.
What current is drawn from the line if the supply voltage is V? Thus, the net current drawn from the supply is 0. Which uses more energy, a W TV set in 1 hr, or a W toaster in 10 minutes? For TV set :. For toaster :. Thus, the TV set uses more energy than a toaster. An electric heater of resistance draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater. The heat developed in the heater is H.
The rate at which heat is developed is given as. Explain the following. The tungsten used almost exclusively for filament of electric lamps because the melting point of tungsten is very high. The bulb glows at a very high temperature.
So tungsten filament does not melt when bulb glows. The conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal because the resistivity of the alloy is more than a pure metal. So the resistance will be hight and the heating effect will be high. If any of the elements in the circuit get damaged the entire circuit will be affected. If an element brake there will not be any current flow through the circuit.
So the series circuit is not preferred in the domestic circuit. We know that. Thus, the resistance of a wire is inversely proportional to its area of cross-section. Copper and aluminum wires usually employed for electricity transmission because they have low resistivity and they are good conductors of electricity. The class 10 Science chapter 12 NCERT solutions is one of the most important chapters that will help in learning about electrical energy. Students will learn about water, steam, and nuclear energy, etc.
The main aim of NCERT solutions for class 10 science chapter 12 is to give a better knowledge of how to use the concept while answering the questions. The electric current can be classified as direct current DC and alternating current ac AC. A voltmeter is always connected in parallel across the circuit whereas an ammeter is always connected in series with the circuit whose current is to be measured.
Reciprocal of the resistance is known as conductance whereas the reciprocal resistivity is known as conductivity. NCERT solutions for class 10 science. Practicing concepts and questions plays a vital role while preparing for class 10 board exams.
NCERT solutions for class 10 science Chapter 12 is the best study material you can have for exam preparation. Answer: Along with questions and concepts of class 10 chapter, practicing CBSE previous year question papers are mandatory for board exams. Answer: Yes, it helps in higher studies if students chooses the Science stream because class 12 has current electricity chapter in syllabus.
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Updated on Feb 17, - 6 p. IST by Team Careers Ask Mr AL Share. Table of contents. Answer: A closed and continuous path of electric current is known as the electric circuit. Answer: Ampere A is unit of current. Answer: Battery, cell or power supply source helps to maintain a potential difference across a conductor. Answer: The potential difference between two points is 1 V means 1 J of work is required to move a charge of amount 1C from one point to another.
J Thus, 6J energy is given to each coulomb of charge passing through a 6 V battery. Answer: The resistance of a conductor depends on : 1. Answer: The resistivity of an alloy is higher than pure metal so alloy Ncert Solutions Class 10th Light Mode does not melt at high temperature. Answer: Lower the value of resistivity lower will be the resistance for a material of given area and length.
Answer: The schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a resistor, an resistor, and a resistor, and a plug key, all connected in series is as shown below :.
By Ohm's law, The reading of the ammeter is o. Answer: In parallel, there is no division of voltage among the appliances so the potential difference across all appliance is equal and the total effective resistance of a circuit can be reduced. Answer: The heating element of an electric heater is a resistor. Answer: The rate at which energy is delivered by a current is power.
Hence, Thus, option D is correct. Answer: A voltmeter should be connected in parallel, to measure the potential difference between two points. The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given be low Ncert Solutions For Class 10th Hindi Sparsh Model � I amperes 0.
Thus, Hence, 4 resistors of Ohm are connected in parallel to obtain 44 Ohm. Thus, Hence, bulbs of Ohm are connected in parallel to obtain 44 Ohm. Compare the power used in the resistor in each of the following circuits: i a 6 V battery in series with and resistors ii a 4 V battery in parallel with and resistors. Answer: The tungsten used almost exclusively for filament of electric lamps because the melting point of tungsten is very high.
Answer: The conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal because the resistivity of the alloy is more than a pure metal. Answer: If any of the elements in the circuit get damaged the entire circuit will be affected. Answer: We know that Thus, the resistance of a wire is inversely proportional to its area of cross-section.
Answer: Copper and aluminum wires usually employed for electricity transmission because they have low resistivity and they are good conductors of electricity. Chapter No. Answer: Class 10 Science Chapter 12 Electricity carries 6 to 8 marks. Latest Articles. Kendriya Vidyalaya Pune Admission - Check the admission p Read More. Name a device that helps to maintain a potential difference across a conductor.
Electric cell or A battery is a device that helps to maintain a potential difference across a conductor. What is meant by saying that the potential difference between two points is 1V?
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. How much energy is given to each coulomb of charge passing through a 6 V battery?
Will current flow more easily through a thick wire or thin wire of the same material, when connected to the same source? 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? Why are the coils of electric toasters and electric irons made of an alloy rather than a pure metal? The coils of electric toaster and electric iron are made of an alloy rather than a pure metal because of the following reasons:.
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? Since all the three resistors are connected in series, so, the equivalent resistance R is equal to the sum of all resistance.
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?
What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series? Following are the advantages of connecting electrical devices in parallel with the battery:. Parallel circuits device the current among the electrical devices so that they can help necessary amount of current to operate properly.
Why does the cord of an electric heater not glow while the heating element does? The resistance of the cord of an electric heater is low compared to the heating element.
The heating element of the heater is made up of an alloy, which has more resistance than its constituent metals. So, It becomes too hot and Glow red. Compute the heat generated while transferring C of charge in one hour through a potential difference of 50 V. An electric iron of resistance 20 Q takes a current of 5 A. Calculate the heat developed in 30 s. A piece of wire of resistance R is cut into five equal parts.
These parts are then connected in parallel. Which of the following terms does not represent electrical power in a circuit?
An electric bulb is rated V and W. When it is operated on V, the power consumed will be:. Two conducting wires of same material and of equal lengths and 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 :.
How is a voltmeter connected in the circuit to measure the potential difference between two points? To measure the potential difference between them a voltmeter should be connected in parallel across any two points in a circuit.
A copper wire has a diameter 0. How much does the resistance change if the diameter is doubled? The values of the current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below:. When a 12 V battery is connected across an unknown resistor, there is a current of 2.
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