Class name Subject Book title Chapter number Content Created at
Class X Science Science 11 to anywhere in between the resistors. Note the ammeter reading each time. ■ Do you find any change in the value of current through the ammeter? You...
Class X Science Science 11 the circuit. The current through each resistor is also I. It is possible to replace the three resistors joined in series by an equivalent single re...
Class X Science Science 11 = 20 Ω × 0.25 A = 5 V; and, that across the conductor, V2= 4 Ω × 0.25 A = 1 V. Suppose that we like to replace the series combination of electric l...
Class X Science Science 11 the voltmeter across each individual resistor (see Figure 11.10 Fig. 11.11). Electricity 185 Reprint 2026-27 ■ Take out the plug from the key. Remo...
Class X Science Science 11 the current in the resistors, we use Ohm’s law. The current I ,1through R 1= V/ R 1 I = 12 V/5 Ω = 2.4 A. 186 Science Reprint 2026-27 The current I...
Class X Science Science 11 circuit. Thus it is obviously impracticable to Figure 11.12 connect an electric bulb and an electric heater in series, because they Anelectriccircu...
Class X Science Science 11 power is used for 1 hour. The commercial unit of electric energy is kilowatt hour (kW h), commonly known as ‘unit’. 1 kW h = 1000 watt × 3600 secon...
Class X Science Science 11 electrons. ■ The SI unit of electric current is ampere. ■ To set the electrons in motion in an electric circuit, we use a cell or a battery. A cell...
Class X Science Science 11 not represent electrical power in a circuit? (a) I R (b) IR (c) VI (d) V /R 3. An electric bulb is rated 220 V and 100 W. When it is operated on 11...
Class X Science Science 11 Ω, (ii) 4 Ω. 12. 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 par...
Class X Science Science 11 Why are copper and aluminium wires usually employed for electricity transmission? 194 Science Reprint 2026-27
Class X Science Science 12 CHAPTER 12 Magnetic Effects of Electric Current n the previous Chapter on ‘Electricity’ we learnt about the heating I effects of electric current. ...
Class X Science Science 12 oersted in his honor. Reprint 2026-27 12.1 MAGNETIC FIELD AND FIELD LINES We are familiar with the fact that a compass needle gets deflected when b...
Class X Science Science 12 compass and a bar magnet. ■ Place the magnet on a sheet of white paper fixed on a drawing board, using some adhesive material. ■ Mark the boundary ...
Class X Science Science 12 field lines in Fig. 12.4). Inside the magnet, the direction of field lines is from its south pole to its north pole. Thus the magnetic field lines ...
Class X Science Science 12 deflection of the needle. You will see that now the needle moves in opposite direction, that is, towards the west [Fig. 12.5 (b)]. It means that th...
Class X Science Science 12 times. Observe the pattern of the iron filings. You would find that the iron filings align themselves showing a pattern of concentric circles aroun...
Class X Science Science 12 instruments. Example 12.2 An electron enters a magnetic field at right angles to it, as shown in Fig. 12.14. The direction of force acting on the e...
Class X Science Science 12 and the brain. The r magnetic field inside the body forms the basis of obtaining the images of different body o parts.Thisisdoneusingatechniquecall...
Class X Science Science 12 circuits Figure 12.15 gives a schematic diagram of one of the common domestic circuits. In each separate circuit, different appliances can be conne...
Class X Science Science 12 compass needle is a small magnet. Its one end, which points towards north, is called a north pole, and the other end, which points towards south, i...
Class X Science Science 12 insulation, which is a neutral wire. The potential difference between the two is 220 V. The third is the earth wire that has green insulation and t...
Class X Science Science 13 CHAPTER 13 Our Environment e have heard the word ‘environment’ often being used on the W television, in newspapers and by people around us. Our eld...
Class X Science Science 13 in the market. 208 Science Reprint 2026-27 ■ If we add a few aquatic plants and animals it can become a selfsustaining system. Can you think how th...
Class X Science Science 13 Activity 13.2 ■ While creating an aquarium did you take care not to put an aquatic animal which would eat others? What would have happened otherwis...