If there is one formula you must memorize for your Form 2 exercises, it is . It connects the three concepts above.
The charged ruler induces an opposite charge on the surface of the neutral pieces of paper. Because opposite charges attract, the attractive force overcomes gravity, causing the paper to stick to the ruler. Top Tips for Exam Success
Initial exercises often involve identifying components and their functions within a circuit. Electric Current (
In circuit diagrams, trace the path of the current from the positive terminal (+) to the negative terminal (-) to determine if components are in series or parallel.
If a water system is compared to an electric circuit: The water flow represents the electric current (electrons) . The water pipe represents the connecting wire . The pump represents the electric cell/battery . Part D: Ohm’s Law and Resistance NCERT Solutions Class 10 Science Chapter 11 Electricity f2 science electricity exercise top
When analyzing circuits, it's important to know the standard circuit symbols:
| | Symbol | Definition | SI Unit | Measuring Instrument | | :--- | :--- | :--- | :--- | :--- | | Electric Current (I) | I | The rate of flow of electric charge (electrons) through a conductor. | Ampere (A) | Ammeter (connected in series) | | Potential Difference / Voltage (V) | V | The "electrical pressure" or energy given to each unit of charge that pushes the current through a component. | Volt (V) | Voltmeter (connected in parallel) | | Resistance (R) | R | The opposition to the flow of electric current within a component. | Ohm (Ω) | Ohmmeter / Multimeter | | Ohm's Law | | A fundamental relationship that links the three quantities above. The current through a conductor is directly proportional to the voltage across it, provided the temperature remains constant. | | ( V = I \times R ) |
— A voltmeter must always be connected in parallel across a component to measure its potential difference. Ammeters are connected in series.
In a parallel circuit, each branch operates independently. The voltage across the remaining branches stays constant, so the other bulbs maintain their original brightness. Section B: Structured & Calculative Problems If there is one formula you must memorize
Rtotal=2Ω+4Ω=6Ωcap R sub t o t a l end-sub equals 2 space cap omega plus 4 space cap omega equals 6 space cap omega Use Ohm's Law.
): The opposition to the flow of current. Measured in . The Golden Formula: Ohm’s Law V=I×Rcap V equals cap I cross cap R
A. Live wire B. Neutral wire C. Earth wire D. Fuse wire
(though basic for F2, it helps with resistance concepts) and power calculations. If a water system is compared to an
| Feature | Series Circuit | Parallel Circuit | | :--- | :--- | :--- | | | The current is the same everywhere in the circuit. | The total current is divided between the different branches. | | Voltage | The total voltage is shared between the components. | The voltage is the same across each branch. | | Resistance | The total resistance is the sum of all resistances: ( R_t = R_1 + R_2 + R_3 + ... ) | The reciprocal of the total resistance is the sum of the reciprocals: ( \frac1R_t = \frac1R_1 + \frac1R_2 + \frac1R_3 + ... ) | | Component Failure | If one component fails (e.g., a bulb blows), the circuit is broken and all components stop working. | If one branch fails, current continues to flow through the other branches, and they continue to function. | | Switches | A single switch controls the entire circuit. | Multiple switches can control individual branches. | | Brightness | Adding more components in series makes all of them dimmer. | Adding more branches in parallel does not affect the brightness of the existing components. |
Components are in a single path. If one bulb breaks, all go out.
) : Defined as the rate of flow of electric charge. It is measured in using an ammeter , which must be connected in series within a circuit. Voltage (
A circuit consists of a 6V battery connected to two identical bulbs, Bulb X and Bulb Y, arranged in a series circuit.
A. The other bulbs will shine brighter. B. The other bulbs will stay lit. C. The circuit is broken and all other bulbs go out. D. The battery will explode.