It comes into notice when two bodies are rubbed with each other. (i) Draw a closed circuit diagram consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key. When high current flow through the fuse (current higher than the rated value) then the heat developed in the wire melts it and breaks the circuit. 1 Kilowatt hour = 1000 Watt × 3600 Second, 1 Kilowatt hour = 3.6 × 10 (c) What is the commercial unit of electric energy? 13. 29. Find the number of electrons that will flow per second to constitute a current of 1 ampere. For the wires of same length and same thickness, resistance depends on the nature of material of the wire, i.e. (b) State the relation between work, charge and potential difference for an electric circuit. Your No1 source for The principle of the electric motor is based on the fact that a current carrying conductor produces a magnetic field around it. (i) What will happen to the glow of other two bulbs if the bulb B3 gets fused? So great notes. For example -  A unit of positive charge is at a point at infinity and we try to bring it to point b that is in the electric field of some other charge, let’s say charge q2. Similarly, you will learn about the electric power formula in detail over here. Few examples of insulating materials are glass, rubber, mica, plastic, dry wood etc. Role of resistance in electrical circuits is similar to the role of friction in mechanics. In other words, it is the rate of flow of electric charges (electrons) in a conductor (for example copper or metallic wire). Therefore, potential difference across each of  them will be 220 V, because no division Of voltage occurs in a parallel circuit. (d) 25, 2. I am heartily thanking you for providing such good notes. Answer. fantastic it is. So, new resistance is (1/16)th of original resistance. Electric Charge. //var today = now.getFullYear()+"-"+(month)+"-"+(day); It is good but need to add some more extra discription. Answer. Question 2. Table given below shows symbols used to represent some of the most commonly used electrical components. 1 kWh = 1000 Wh = 1000 J/S x 3600 sec Electricity Electric Potential and Potential Difference. It is always connected in series in a circuit through which the current is to be measured. Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. We find that V/I is same and found to be a constant. Class 10 Science Electricity Very Short Answer Type Questions [1 Mark] – Year 2015. Current Electricity:Current electricity is a type of electricity when the electronic charges that develop are also in motion. All electrical appliances work at a constant voltage. And further, coulomb was the one who gave more information about the charges. Which one of the above sets of readings can be rejected? Principle is coil keep inside the two magnetic when you apply the batter (current)which experience the force due to current in coil and mg field . Suppose, if an electric heater consumes 1000W at 220V. Answer. (b) The conductors of electric heating devices such as bread toasters and electric irons are made of alloy because resistivity of an alloy is more than that of metals. The principle of the electric motor is based on the fact that a current carrying conductor produces a magnetic field around it. How is an ammeter connected in a circuit to measure current flowing through it? (a) Effective resistance of two 8 W resistors in the combination If we add potential difference across each one of resistors (R1, R2 and R3) then we get. (a)(i) Ammeter reading in the second case is half of the ammeter reading Electric power Definition – It is the rate at which work is done or energy is transformed in an electrical circuit.Simply put, it is a measure of how much energy is used in a span of time. Using Ohm’s law, find the equivalent resistance of the combination, i.e. (a) 1/25 Answer. Answer. 28. It helps me at last moment! (d) 25 W, 4. It is because resistance of wire is directly proportional to the length of wire. P = ^2/. It made learning of electric motor to easy Calculate the mean value of resistance of the resistor based on the remaining four sets of readings. They have free mobile electrons. P= (15)2 x 8 = 1800 J/s In physics, the rate of transfer of electrical energy by an electrical circuit per unit time is called electrical power. Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A? Thanks to dronstudy.com for give me standard notes. 12. We know that current through a conductor depends upon its resistance and potential difference across its ends. Wire ‘Y’ has greater resistance as it has more length than wire ‘X’. Class 10 Science Electricity Very Short Answer Type Question [1 Mark] – Year 2014, 9. (c) If every resistor of the circuit is of 2 Ω, what current will flow in the circuit? Where, Ans. Thus, in this case a fuse of 5A should be used to protect the electric heater in the case of flow of higher voltage. I could easily understand about electric motor . From equation 17 we know that P=VI (b) Which two resistors are connected in parallel? An electric bulb is connected to a 220 V generator. 9. Procedure : 7. 14. PLEASE READ MY DISCLOSURE FOR MORE INFO. heat produced, as it offers high resistance to the flow of current through it. Electric Motor is a device which converts electrical energy into mechanical energy. Answer. From graph we see that these two quantities V and I are directly proportional to one another. NCERT Question 16 - Two carbon brushes press against the commutator.These brushes act as contact between commutator and terminal battery. This consists of 1 mark Questions, 3 Mark Numericals Questions, 5 Marks Numerical Questions and previous year questions from Electricity Chapter. We know that We know that. Last Updated on October 2, 2020 By Mrs Shilpi Nagpal 69 Comments. 16. $I = \frac{{24V}}{{60\Omega }} = 0.4A$ Note: Current flows only if electric circuit forms closed loop. Answer. It has two terminals T1 and T2 to which fuse wire is attached. The heating effect of electric current is utilized in electric bulbs or electric lamps for producing light. Answer. For example Cu, Al, etc. (a) individual branch in the circuit completes its own circuit, or if (i < 10) { Mathematically, resistivity of the conducting material is given by I really like your notes ….And these notes are very helpful in board exams ….Thanku so much…☺️. these notes were so good that a student who has just started class 9 like me, can also completely study class 10 electricity. 13. govind kumar says. Value of resistance depends upon the nature, dimension and physically dimensions of the conductor. Superb notes. Calculate (i) its power, (ii) its resistance and (iii) the energy consumed, if this bulb is lighted for four hours. Connect voltmeter in parallel with these resistors between the terminals X and Y. For the electric circuit given below calculate: Heat produced depends upon the square of current, resistance and temperature. really helpful at the end moment to revise the whole content. Direction of flow of electrons gives the direction of electronic current by convention, the direction of flow of positive charge is taken as the direction of conventional current. q Power P = Heat produced per unit time = Heat produced / t, 1 kWh = 1000 watt X 1 hour = 1000 W x 3600 s, ⇒ 1kWh = 3.6 x 106 watt second = 3.6 x 106 J. Solution unit of resistivity. So we can say that resistors R1 and R2 are connected in series combination. 13.Two wires A and B are of equal length and have equal resistance. EXCELLENT NOTES....HELPED ME A LOT TO SCORE GOOD MARKS IN THE EXAM...THANKS.. In the given circuit, connect a nichrome wire of length ‘L’ between points X and Y and note the ammeter reading. This is very good website (c) 50 W Dear sir , (c) 1:4 Remove marked 3 nichrome wire from the gap XY. Following graph was plotted between V and I values. How is this law verified experimentally? Electrons are negatively charged particles and protons, of which nucleus is made of, are positively charged particles. Set up a circuit as shown above. Am. If in place of bulb, a heater of resistance 100 Ω is connected to the sources, calculate the current drawn by it. I = / I would like to thank all the members working in DronStudy. when three bulbs of: All the connection should be tight and properly connected as per circuit diagram. Give one example of each. 50. Why? Which of the following terms does not represent electrical power in a circuit? These notes just made this so much hard lesson very easy. Class 10 Science Electricity Short Answer Type Questions[ll] [3 Marks] – Year 2011. (ii) On doubling the area of cross-section without changing the length of the conductor, twice of the previous reading is observed in the ammeter. (ii) Note the reading in the ammeter for the current I and in the voltmeter for the potential difference, (V) across the nichrome wire. (b) The temperature of the filament of bulb is 2700°C when it glows. Awesome websites for children that provides free class notes on electric motor class 10. thanku sir it is a greatfull hub for getting knolge. Rate at which electric work is done or the rate at which electric energy is consumed , is called electrical power. Notes for electricity chapter of class 10 science. Removing proportionately sign, we have