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PAGE 1 — WHAT IS ELECTRIC CURRENT? Panel 1 Scene: Class 10 science classroom. Mr. Rao draws a circuit on the board. Arjun: Sir, what exactly is electric current? Mr. Rao: Electric current is the rate of flow of electric charge through a conductor. Panel 2 Electrons move through a wire. Meera: In a metal wire, electric current is caused by moving electrons. Spark: Tiny charges on the move! Panel 3 Mr. Rao writes: I = Q/t Mr. Rao: Current is charge flowing per unit time. Panel 4 Arjun: What is its SI unit? Meera: The SI unit is the ampere (A). Mr. Rao: One ampere means one coulomb of charge flows in one second. Panel 5 A battery, switch and bulb are shown. Arjun: Does current flow through an open circuit? Mr. Rao: No. The circuit must have a complete conducting path. Panel 6 The switch closes and the bulb lights. Spark: Complete circuit = current can flow! Arjun: So electricity needs a path to travel. PAGE 2 — POTENTIAL DIFFERENCE AND CIRCUITS Panel 1 Mr. Rao holds up a battery. Mr. Rao: But what makes charges move through a circuit? Arjun: The battery? Panel 2 Mr. Rao: More precisely, the battery provides a potential difference, or voltage. Meera: It acts like a push that drives charge through the circuit. Panel 3 Mr. Rao writes: V = W/Q Mr. Rao: Potential difference is the work done to move a unit charge between two points. Panel 4 Arjun: What's the SI unit? Mr. Rao: Volt (V). Spark: One volt = one joule per coulomb! Panel 5 A voltmeter is connected across a bulb. Meera: A voltmeter measures potential difference. Mr. Rao: Therefore, it is connected in parallel. Panel 6 An ammeter is shown in series. Mr. Rao: An ammeter measures current and is connected in series. Spark: Ammeter → series! Voltmeter → parallel! PAGE 3 — RESISTANCE Panel 1 Arjun tries to push through a narrow doorway. Arjun: Why is this so difficult? Meera: Imagine electric charges facing something similar. That's resistance. Panel 2 Mr. Rao: Resistance is the property of a conductor that opposes the flow of electric current. Panel 3 Mr. Rao writes: R = V/I Arjun: So resistance depends on voltage and current? Mr. Rao: For a conductor under appropriate constant conditions, yes. Panel 4 Mr. Rao: The SI unit of resistance is the ohm (Ω). Spark: Higher resistance → less current for the same voltage! Panel 5 Three wires appear: long, short, thin and thick. Meera: Resistance increases with the length of a wire. Mr. Rao: And resistance decreases when its cross-sectional area increases. Panel 6 Different materials appear. Mr. Rao: Resistance also depends on the material and temperature. Arjun: So the wire itself matters! PAGE 4 — OHM'S LAW Panel 1 Mr. Rao sets up a battery, resistor, ammeter and voltmeter. Mr. Rao: Let's investigate Ohm's Law. Panel 2 Mr. Rao changes the voltage. Arjun: The current changes too! Meera: Let's record the readings. Panel 3 Mr. Rao writes: V ∝ I Mr. Rao: At constant temperature, potential difference is directly proportional to current. Panel 4 He writes: V = IR Spark: The famous Ohm's Law! Panel 5 A straight-line V-I graph through the origin appears. Meera: The V-I graph is a straight line through the origin for an ohmic conductor under constant physical conditions. Panel 6 Arjun: If V = 12 V and R = 4 Ω, then... Meera: I = V/R = 3 A. Spark: Electricity math complete! PAGE 5 — RESISTIVITY Panel 1 Meera holds a copper wire and a nichrome wire. Arjun: Why don't all materials have the same resistance? Mr. Rao: Because materials have different resistivities. Panel 2 Mr. Rao writes: R = ρL/A Mr. Rao: Here, ρ represents resistivity. Panel 3 Meera: L is the length and A is the cross-sectional area. Mr. Rao: Correct. Panel 4 A long wire and short wire are compared. Mr. Rao: Increasing length increases resistance. Arjun: Increasing area decreases resistance. Panel 5 Copper wires are shown in a house. Mr. Rao: Copper has low resistivity, so it is useful for electrical wiring. Panel 6 A nichrome heating element glows. Mr. Rao: Nichrome has relatively high resistivity and a high melting point, making it useful in heating elements. Spark: Material matters! PAGE 6 — SERIES AND PARALLEL Panel 1 Three resistors are connected one after another. Mr. Rao: This is a series combination. Panel 2 Mr. Rao writes: Rs = R₁ + R₂ + R₃ Meera: The same current flows through each resistor in series. Panel 3 One bulb breaks and all the bulbs go out. Arjun: So one break can stop the whole circuit! Mr. Rao: Exactly. Panel 4 Three resistors are now connected in parallel. Mr. Rao: In a parallel combination, the potential difference across each branch is the same. Panel 5 Mr. Rao writes: 1/Rp = 1/R₁ + 1/R₂ + 1/R₃ Meera: The current divides among the different branches. Panel 6 A house with a fan, TV and light is shown. Mr. Rao: Domestic appliances are connected mainly in parallel. Arjun: So each appliance can work independently! PAGE 7 — HEATING EFFECT OF ELECTRIC CURRENT Panel 1 An electric heater glows red. Arjun: Why does the heater become hot? Mr. Rao: Electrical energy is converted into heat when current passes through resistance. Panel 2 Mr. Rao writes: H = I²Rt Mr. Rao: This is the Joule's law of heating. Panel 3 Meera: Heat depends on current, resistance and time. Spark: And current has a squared effect! Panel 4 Pictures of an iron, toaster, kettle and heater. Mr. Rao: This effect is useful in electric heaters, irons, toasters and kettles. Panel 5 A fuse wire melts. Arjun: What's the purpose of a fuse? Mr. Rao: If excessive current flows, the fuse wire heats up and melts, breaking the circuit. Panel 6 Spark wears a superhero cape. Spark: Fuse = circuit protector! Mr. Rao: Never replace electrical safety devices with unsafe substitutes. PAGE 8 — ELECTRIC POWER AND ENERGY Panel 1 A fan, bulb and heater operate at different rates. Arjun: How do we measure how quickly an appliance uses electrical energy? Mr. Rao: We use electric power. Panel 2 Mr. Rao writes: P = VI Mr. Rao: Power is the rate of consumption of electrical energy. Panel 3 More formulas appear: P = I²R P = V²/R Meera: These forms come from Ohm's law. Panel 4 A 100 W bulb and 1000 W heater are compared. Arjun: The 1000 W heater uses energy faster. Mr. Rao: Correct. Panel 5 An electricity meter is shown. Mr. Rao: Electrical energy used in homes is commonly measured in kilowatt-hours (kWh). Meera: One kWh is called one unit of electrical energy. Panel 6 Spark points dramatically at the equation: 1 kWh = 3.6 × 10⁶ J Spark: Remember this for your exam! PAGE 9 — DOMESTIC ELECTRIC CIRCUITS & FINAL REVISION Panel 1 The students enter a house containing lights, fans and appliances. Arjun: How does electricity safely reach all these appliances? Mr. Rao: Through a domestic electric circuit. Panel 2 A diagram shows Live, Neutral and Earth wires. Mr. Rao: Domestic circuits use live, neutral and earth connections. Meera: Appliances are connected in parallel. Panel 3 A three-pin plug is shown. Mr. Rao: The earth connection provides a safer path for leakage current and helps reduce the risk of electric shock when properly connected. Spark: Safety first! Panel 4 An MCB/fuse and switch are shown. Mr. Rao: Fuses and circuit breakers protect circuits from excessive current and short circuits. Arjun: So safety devices are essential! Panel 5 — RAPID REVISION All the key formulas appear around the characters: I = Q/t V = W/Q V = IR R = ρL/A H = I²Rt P = VI 1 kWh = 3.6 × 10⁶ J Meera: Current, potential difference, resistance, resistivity, Ohm's law, heating, power and energy! Panel 6 — FINAL SPLASH PAGE All four characters stand dramatically with a glowing electric circuit behind them. Arjun: I understand the Electricity chapter now! Meera: Electricity isn't just about formulas. It's about understanding how charge moves and how electrical energy is transferred. Mr. Rao: Learn the concepts, understand the equations, and practice the numericals. Spark: ⚡ ELECTRICITY MASTERED! ⚡ THE END