Renewable Energy Systems Assessment

What is the primary function of semiconductors like silicon in solar cells?

• To reflect sunlight away from the cell

• To conduct electricity under specific conditions

• To store electrical energy for later use

• To increase the temperature of the cell

In solar cell efficiency, what does the formula E = V × I × t calculate?

• The voltage output of the cell

• The resistance in the circuit

• The electrical energy produced

• The temperature of the cell

Which factor does NOT affect solar cell efficiency?

• Angle of the sun

• Presence of clouds

• Color of the solar panel

• Dust accumulation on the surface

What is the primary purpose of the aerodynamic blades in wind turbines?

• To reduce noise pollution

• To capture kinetic energy from wind

• To store electrical energy

• To control wind direction

How do wind turbines convert wind energy into electrical energy?

• Through direct solar conversion

• Through chemical reactions

• Through mechanical rotation driving a generator

• Through thermal conversion

What creates the force needed for wind turbine blade rotation?

• Magnetic fields

• Temperature differences

• Electrical current

• Pressure differences between blade sides

In hydroelectric power generation, what determines the amount of potential energy available?

• The width of the dam

• The height of the stored water

• The temperature of the water

• The color of the water

What is the correct sequence of energy conversion in hydroelectric power?

• Mechanical → Kinetic → Potential → Electrical

• Potential → Kinetic → Mechanical → Electrical

• Electrical → Mechanical → Kinetic → Potential

• Kinetic → Electrical → Potential → Mechanical

How do operators control electricity generation in hydroelectric dams?

• By changing the water temperature

• By adjusting the gate openings

• By modifying the turbine shape

• By altering the reservoir depth

What is the role of photons in solar energy conversion?

• They cool the solar cells

• They clean the solar panel surface

• They dislodge electrons from silicon atoms

• They store electrical energy