Electricity
Class 10 · Science
4 ideas in Class 10 Science, explained in plain words, with games and quizzes to practise.
Electric Current, Potential Difference and Ohm's Law
Part of: Current and potential difference
Current tells how much electric charge passes a point each second. A cell provides a potential difference that can drive charge through a closed circuit. For a resistor at a steady temperature, the voltage across it and its current follow a consistent relationship.
Why it matters. These relationships help explain why a lamp draws a certain current and how electrical parts behave when the supply changes. They also help children choose the right equation and unit in circuit problems.
Try it in two minutes
- Write down a current and a time, such as 0.2 ampere for 10 seconds.
- Ask how much charge passes by multiplying the current by the time.
- Give a work value and a charge value, then ask how much work each coulomb receives.
- Compare voltage and current for one resistor while keeping its temperature unchanged.
Try at home. Use a battery-powered circuit diagram and ask your child to identify where current flows when the switch is closed.
Resistance, Dimensions and Materials
Part of: Resistance of conductors
A longer wire usually resists current more, while a thicker wire offers less resistance. The material matters too: resistivity describes how strongly a material resists current for a given shape. Resistance and resistivity can also change with temperature.
Why it matters. These ideas explain why transmission wires and heating coils use different materials and shapes. They help children predict circuit changes without treating every wire as identical.
Try it in two minutes
- Compare two drawings of wires made from the same material, one longer than the other.
- Ask which wire has more resistance if their thickness is equal.
- Compare a thin wire with a thicker wire of the same length and material.
- Discuss why a heating coil and a power cable need different properties.
Try at home. Sketch a short, thick wire and a long, thin wire, then ask which change would make resistance increase or decrease.
Series and Parallel Circuits
Part of: Combining resistors
In a series path, the same current passes through each resistor, and their resistances add. In parallel branches, each resistor has the same voltage, branch currents add, and the combined resistance is lower than any branch resistance.
Why it matters. Knowing the difference helps children understand why household devices are connected in parallel and how to work out current in a more complex circuit.
Try it in two minutes
- Draw two resistors one after another and trace the single path for current.
- Draw two branches between the same two points and label their shared voltage.
- Ask what adds in series and what adds in parallel.
- Combine one simple series part with one parallel part.
Try at home. Use two different coloured lines to sketch a single-path circuit and a branching circuit, then compare current and voltage in each.
Heating Effect, Fuses and Electric Power
Part of: Heating and power
A resistor carrying current turns some electrical energy into heat. The heating depends on current, resistance and time. Power describes how quickly energy is used, while a kilowatt-hour measures energy. A fuse uses heating to break a circuit when current is too high.
Why it matters. These ideas explain how heaters work, why a fuse protects a circuit and how electricity use is measured. They also prevent common mix-ups between power, energy and heat.
Try it in two minutes
- Compare two heating situations while keeping resistance and time fixed.
- Ask what happens to heating if current doubles.
- Separate a device's power rating from how long it runs.
- Describe how a fuse opens the circuit when excessive current heats it.
Try at home. Compare the energy used by two imagined appliances by multiplying each power rating by its operating time.
What your child will practise
- Electric Current, Potential Difference and Ohm's Law: Jungle Quick Fire (Quick Fire)
- Heating Effect, Fuses and Electric Power: Candy Quick Fire (Quick Fire)
- Heating Effect, Fuses and Electric Power: Mission Control Quest (Collect the Answer)
- Resistance, Dimensions and Materials: Jungle Puzzle (Clue Puzzle)
- Series and Parallel Circuits: Lab Explorer Sort (Sort It Out)
- Quiz: Electric Current, Potential Difference and Ohm's Law (8 questions)
- Quiz: Heating Effect, Fuses and Electric Power (8 questions)
- Quiz: Resistance, Dimensions and Materials (8 questions)
- Quiz: Series and Parallel Circuits (8 questions)