Electrical Systems - JSS2 Basic technology Past Questions and Answers - page 2
Which component protects electrical circuits from overload and short circuits?
Capacitors
Resistors
Circuit breakers
Inductors
In which sector are electrical systems crucial for powering lighting, heating, and appliances?
Aerospace
Residential
Defence
Healthcare
What do switches do in electrical systems?
Store electrical energy
Convert AC to DC
Control the flow of electricity
Generate electrical signals
What type of electrical system is typically used in powering office equipment and HVAC systems?
DC
AC
Renewable energy
Battery operated
What role do inductors play in electrical circuits?
Store electrical energy
Amplify electrical signals
Convert AC to DC
Resist changes in current flow
What distinguishes AC (Alternating Current) from DC (Direct Current) in electrical systems?
AC flows in both directions periodically, changing direction continuously. It is preferred for long-distance transmission due to lower energy losses over extended cables. In contrast, DC flows in one direction steadily and is commonly used in electronics and batteries for its stable voltage characteristics.
How do switches function in electrical systems, and what role do they play?
Switches control the flow of electricity within electrical circuits, allowing for manual interruption or connection of circuits. They serve crucial roles in managing electrical loads, ensuring safety by preventing overload or short circuits, and facilitating operational control in various applications from residential lighting to industrial machinery.
What are the primary components of electrical circuits, and how do they contribute to electricity flow?
Electrical circuits consist of wires, switches, resistors, capacitors, and sometimes inductors. Wires conduct electricity, while switches control its flow. Resistors regulate current and voltage levels, capacitors store and release electrical energy, and inductors resist changes in current flow. Together, these components create pathways for electricity to power devices and systems.
What are the key applications of electrical systems across industries, and why are they essential?
Electrical systems power a wide range of applications across industries. In residential settings, they provide essential services like lighting, heating, and appliance operation. Commercially, they support office equipment and HVAC systems, enhancing productivity and comfort. Industrially, electrical systems drive machinery, automate processes, and ensure safety, playing a vital role in modern infrastructure, manufacturing, and technological advancement.
How does understanding AC and DC currents impact the efficiency and design of electrical systems?
Knowledge of AC and DC currents is critical in designing efficient electrical systems. AC's ability to travel long distances with minimal energy loss influences power grid design and transmission strategies. DC's stable voltage characteristics are advantageous in electronic devices and renewable energy applications. Designing systems that leverage both types effectively improves energy efficiency, reliability, and sustainability in diverse operational contexts.