#1
Which of the following is a renewable source of energy used for electricity generation?
Solar
ExplanationSolar energy is derived from the sun and is renewable.
#2
What is the unit of electric power?
Watt
ExplanationWatt is the standard unit of measurement for electric power.
#3
Which material is commonly used as a conductor in household electrical wiring?
Copper
ExplanationCopper is a common conductor due to its high conductivity and availability.
#4
What is the function of a circuit breaker in an electrical system?
Interrupt current flow
ExplanationCircuit breakers interrupt the flow of current in case of overloads or faults to prevent damage.
#5
What is the function of a capacitor in an electrical circuit?
Store electrical energy
ExplanationCapacitors store electrical energy and release it when needed, acting as temporary energy storage devices.
#6
Which law describes the relationship between the current, voltage, and resistance in an electrical circuit?
Ohm's Law
ExplanationOhm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
#7
What is the primary function of a transformer in an electrical power system?
Change voltage levels
ExplanationTransformers are used to step up or step down voltage levels in electrical power systems.
#8
What is the main advantage of alternating current (AC) over direct current (DC) for long-distance power transmission?
Higher voltage levels
ExplanationAC allows for the use of higher voltage levels, reducing energy losses during long-distance transmission.
#9
In a power grid, what is the purpose of a step-up transformer?
Increase voltage
ExplanationStep-up transformers increase voltage levels for efficient long-distance transmission.
#10
What is the primary fuel used in nuclear power plants for electricity generation?
Uranium
ExplanationUranium is the primary fuel used in nuclear fission reactions to generate electricity.
#11
Which type of power plant uses the energy stored in the Earth's internal heat for electricity generation?
Geothermal power plant
ExplanationGeothermal power plants utilize heat from the Earth's core to generate electricity.
#12
Which renewable energy source is known for its intermittent nature and dependence on weather conditions?
Wind power
ExplanationWind power generation relies on wind availability, making it intermittent and weather-dependent.
#13
What is the concept of 'smart grids' in the context of electricity distribution?
Grids with advanced communication and control systems
ExplanationSmart grids utilize digital technology for efficient monitoring, control, and optimization of electricity distribution.
#14
What is the term for the phenomenon where a material retains its electric polarization even after the external electric field is removed?
Hysteresis
ExplanationHysteresis refers to the lag between the application and removal of an external force on a material.