Learn ModeChallenging Energy Conversions for PSLE
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What is the most common form of energy 'lost' or 'wasted' during most energy conversions in everyday appliances?
Heat energy (or thermal energy).Describe the complete energy conversion that occurs when a car engine burns petrol to move the car, naming all significant forms.
Chemical potential energy (in petrol) → Heat energy (from combustion) → Kinetic energy (of moving pistons) → Kinetic energy (of moving car) + Sound energy + Heat energy (from friction).A hydroelectric dam converts the potential energy of water into electrical energy. Name the *intermediate* energy form involved after the water flows down but before electricity is generated.
Kinetic energy (of the moving water turning the turbine).When a primary battery powers a torchlight, explain the energy conversion, specifically naming the *initial* and *final* desired forms of energy.
Chemical potential energy (in battery) → Electrical energy → Light energy (from bulb) + Heat energy.Photosynthesis in plants converts light energy into what *specific* type of potential energy?
Chemical potential energy (stored in glucose/food).An electric fan converts electrical energy primarily into kinetic energy. What other *two* forms of energy are also produced, indicating some energy loss?
Sound energy and heat energy (due to friction and electrical resistance).Explain how a solar panel converts energy, specifying only the *input* and *output* energy forms.
Light energy (from the sun) → Electrical energy.When a loudspeaker is playing music, what is the main energy conversion happening to produce sound?
Electrical energy → Kinetic energy (of speaker cone vibration) → Sound energy.A stretched rubber band has potential energy. What *specific type* of potential energy is this, and what is the primary conversion when it is released to launch a small object?
Elastic potential energy. Conversion: Elastic potential energy → Kinetic energy (of the object).A microphone converts sound waves into electrical signals. What energy conversion does this represent?
Sound energy → Electrical energy.In a thermal power plant, coal is burned to produce electricity. Describe the chain of *four* main energy conversions involved.
Chemical potential energy (coal) → Heat energy (boiling water) → Kinetic energy (steam turning turbine) → Electrical energy (from generator).What principle states that energy cannot be created or destroyed, only converted from one form to another?
Principle of Conservation of Energy.When a ball is thrown upwards, it slows down as it rises. Describe the energy conversion occurring during its ascent, ignoring air resistance.
Kinetic energy → Gravitational potential energy.Name an energy conversion where electrical energy is primarily converted into *thermal* energy for a useful purpose.
Electrical energy → Heat energy (e.g., in an electric kettle, toaster, iron, or electric heater).A wind turbine converts the kinetic energy of wind into electrical energy. What *type* of energy (potential or kinetic) does the wind possess *before* hitting the turbine blades?
Kinetic energy.