Electrical Systems - JSS2 Basic technology Past Questions and Answers - page 1
What distinguishes AC (Alternating Current) from DC (Direct Current) in electrical systems?
AC flows in one direction, while DC flows in both directions.
AC flows in both directions periodically, while DC flows in one direction.
AC is used in electronics, while DC is used in homes.
AC is more efficient for short-distance transmission, while DC is for long distances.
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Which component controls the flow of electricity in electrical systems?
Wires
Resistors
Switches
Capacitors
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What is the primary function of wires in electrical systems?
Control electricity flow
Store electrical energy
Conduct electricity
Convert electrical energy into mechanical energy
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Where are AC electrical systems commonly used due to efficient transmission?
Electronic devices
Homes and businesses
Industrial machinery
Transportation systems
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Which type of current is typically used in electronics and portable devices?
AC
DC
Both AC and DC
None of the above
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What do circuits in electrical systems primarily consist of?
Wires only
Switches only
Pathways for electricity flow
Mechanical components
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What role do resistors play in electrical circuits?
Control voltage levels
Convert AC to DC
Store electrical energy
Control the flow of electricity
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Which industry relies heavily on electrical systems for driving machinery and controlling processes?
Automotive
Agriculture
Information technology
Manufacturing
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What is the primary purpose of capacitors in electrical circuits?
To control voltage spikes
To store electrical energy
To convert AC to DC
To amplify electrical signals
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Why is AC preferred over DC for long-distance transmission?
AC has lower voltage
AC is easier to convert to DC
AC can be easily stored
AC has lower energy losses
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