Wind and Solar

In a photovoltaic (PV) solar panel ________ energy is converted to _________.

• radiant (solar), electrical

• electrical, radiant (solar)

• thermal, radiant (solar)

• radiant (solar), thermal

Tags

NGSS.HS-PS3-3

In a solar heating panel ________ energy is converted to _________.

• radiant (solar), electrical

• electrical, thermal

• thermal, radiant (solar)

• radiant (solar), thermal

Power per unit area is the basic definition of what physics quantity?

• Intensity

• Efficiency

• Field strength

• Impulse

Solar power is different to the other primary energy sources because it

• does not require a turbine to produce electricity

• it is a renewable energy source

• it does not produce carbon dioxide

• it can be used to produce electricity or thermal energy

Tags

NGSS.HS-PS3-3

A wind turbine produces average power P. If the wind speed is reduced in half, what is the new average power.

• 2P

• P/2

• P/4

• P/8

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

A wind turbine has average power output P. If the blade length of the turbine is tripled, what is the new average power?

• 3P

• 9P

• 27P

• P/3

Tags

NGSS.HS-PS3-1

The equation P =¹/₂ A p v³ is a calculation of maximum power input and not real power input because . . .

• The blades do not turn at a constant speed

• The air does not completely stop when it hits the blades

• All of the air molecules will hit the blades

• The blades may hit birds that fly too close

Calculate the minimum area of solar heating panels required to heat 100 kg of water (4180 J kg^-1 K^-1) from 20.°C to 40.°C in 2.0 hours. (solar constant 1360 W m^-2).

• 0.85 m²

• 3073 m²

• 1161 m²

• 58 m²

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Calculate the area needed for PV panels with an efficiency of 21% to charge a battery that stores 9.0 MJ in 8 hours of daylight. (solar constant 1360 W m^-2)

• 1.1 m²

• 174 m²

• 0.048 m²

• 1488 m²

Tags

NGSS.HS-ETS1-2

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Determine the minimum blade length needed for a 85 % efficient wind turbine that needs to sustain an output power of 360 W with a wind speed of 2.5 m s^-1. (air density is 1.3 kg m^-3)

• 3.6 m

• 1.8 m

• 11 m

• 5.8 m

Tags

NGSS.HS-ETS1-3

NGSS.HS-PS3-1

NGSS.HS-PS3-3