Energy Conversion Devices - JSS2 Basic technology Past Questions and Answers - page 2
What type of energy does a motor convert electrical energy into?
Heat energy
Wind energy
Mechanical energy
Light energy
What fundamental principle does a motor operate on?
Electromagnetic induction
Thermodynamics
Conservation of energy
Newton's laws of motion
Which device converts heat energy into mechanical work?
Generator
Motor
Transformer
Heat engine
What is the primary source of energy for a steam turbine?
Wind
Solar radiation
Water
Coal combustion
Why is understanding the principles of energy conversion devices important?
To increase energy costs
To ignore energy efficiency
To optimise energy use
To minimise renewable energy
What role do generators play in energy conversion?
Generators are crucial in converting mechanical energy into electrical energy through electromagnetic induction. They consist of rotating coils within a magnetic field, where the movement induces an electric current. This process is fundamental in various applications such as hydroelectric plants, where water turbines drive generators to produce electricity, showcasing their pivotal role in harnessing renewable energy sources efficiently.
How do motors operate in energy conversion, and what are their key applications?
Motors convert electrical energy into mechanical energy by leveraging electromagnetic principles. They are integral components in numerous applications, ranging from household appliances like washing machines and refrigerators to industrial machinery such as conveyor belts and pumps. Motors enable precise control over mechanical motion, demonstrating their versatility and essential role in modern automation and manufacturing processes.
What are the primary principles governing the operation of heat engines in energy conversion?
Heat engines primarily operate based on thermodynamic principles, converting thermal energy from combustion or other sources into mechanical work. This process involves cyclic operations like intake, compression, combustion, and exhaust. Examples include internal combustion engines in vehicles and steam turbines in power plants, highlighting their efficiency in transforming heat into usable mechanical energy for propulsion and electricity generation.
How do generators utilise electromagnetic induction in converting energy, and what are their environmental impacts?
Generators employ electromagnetic induction by rotating coils within a magnetic field, inducing electric current flow. This method efficiently converts mechanical energy, derived from renewable sources like wind or water, into electrical energy. By harnessing clean energy sources, generators contribute to reducing greenhouse gas emissions and environmental degradation associated with traditional fossil fuel-based electricity generation, promoting sustainable energy practices.
What practical examples illustrate the significance of energy conversion devices in everyday life and industry?
Energy conversion devices such as motors are ubiquitous in daily life, powering essential appliances and equipment. In industry, generators play a critical role in electricity production from renewable sources like solar and hydroelectric power, while heat engines drive transportation and provide mechanical work in manufacturing processes. Understanding these devices' operation enhances efficiency, supports sustainable energy initiatives, and drives technological advancements across various sectors.