Class name Subject Book title Chapter number Content Created at
Class XI Psychology Introduction to Psychology 4 have been given pictures for to pictures have difficulty in the interpretation identification of objects and interpretation of of actions or events...
Class XI Psychology Introduction to Psychology 4 contours. The most primitive form of organisation takes place in the form of figure-ground segregation. • Gestalt psychologists have identified sev...
Class XI Psychology Introduction to Psychology 4 children. Let the visually challenged children feel by touching the toy model for some time. Ask the children to describe the model. Show the same ...
Class XI Psychology Introduction to Psychology 5 Learning Chapter Afterreadingthischapter,youwouldbeableto • describe the nature of learning, • explain different forms or types of learning and the...
Class XI Psychology Introduction to Psychology 5 and characterised as a psychological process. Second, an account is presented that explains how one learns. A number of learning methods that accou...
Class X Science Science 11 6 Wires crossing without joining 174 Science Reprint 2026-27 7 Electric bulb or 8 A resistor of resistance R 9 Variable resistance or rheostat or 1...
Class X Science Science 11 in Fig. 11.3. Thus, V/I is a constant ratio. In 1827, a German physicist Georg Simon Ohm (1787–1854) found out the relationship between the current...
Class X Science Science 11 is often used to change the resistance in the circuit. We will now study about electrical resistance of a conductor with the help of following Acti...
Class X Science Science 11 conductor is retarded by its resistance. A component of a given size that offers a low resistance is a good conductor. A conductor having some appr...
Class X Science Science 11 the same material and of the same length is used in the circuit. A change in ammeter reading is observed when a wire of different material of the s...
Class X Science Science 11 × 10–8 –8 Aluminium 2.63 × 10 Tungsten 5.20 × 10–8 Nickel 6.84 × 10–8 –8 Iron 10.0 × 10 Chromium 12.9 × 10–8 Mercury 94.0 × 10–8 –6 Manganese 1.84 ...
Class X Science Science 11 increased to 120 V the current is given by V 120 V current = = = 8 A . R 15 Ω The current through the heater becomes 8 A. Example 11.5 Resistance o...
Class X Science Science 11 Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to hal...
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 R1= V/ R 1 I = 12 V/5 Ω = 2.4 A. 186 Science Reprint 2026-27 The current I ...
Class X Science Science 11 throughout the electric circuit. Thus it is obviously impracticable to Figure 11.12 connect an electric bulb and an electric heater in series, beca...
Class X Science Science 11 coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω? 11.7 HEA TING EFFECT OF ELECTRIC CURRENT We know that a battery or a cell is a source of electrical energ...
Class X Science Science 11 happens to this energy expended by the source? This energy gets dissipated in the resistor as heat. Thus for a steady current I, the amount of heat...
Class X Science Science 11 resistor as I = √(H/Rt) = √[100 J/(4 Ω × 1 s)] = 5 A Thusthepotentialdifferenceacrosstheresistor, V [fromEq.(11.5)]is V = IR = 5 A × 4 Ω = 20 V. El...
Class X Science Science 11 common application of Joule’s heating is the fuse used in electric circuits. It protects circuits and appliances by stopping the flow of any unduly...
Class X Science Science 11 1 watt of 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 × ...
Class X Science Science 11 of flow of 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 batt...