Power

If it takes 50 seconds and 10 Joules move some books, calculate how much power is required to complete this task.

• 5 J

• 0.2 W

• 5 W

What is the formula for Power?

• E=mc²

• W= F x d

• P = W/t

W = 500 Joules 
t = 25 seconds
P = ???

• 0.05 W

• 20 W

• 12500 W

• 2000 W

It takes 5 seconds and 250 joules to move a full wagon across the street. How much power is needed?

• 50 W

• 0.02 J

• 50 J

If you increase your work and decrease your time, you will have

• more power

• less power

• same amount of power

• power rating can not be determined

Tags

NGSS.HS-PS2-1

Is solar power renewable?

• Yes

• No

• Sometimes

• Only in some places

Solar power for heating is passive when

• no mechanical components are used to move heat around

• there is no sun (at night)

• in winter

• some mechanical components are used to move heat around

Tags

NGSS.MS-PS3-4

Where are concentrating panels usually located?

• On the roofs

• In large sunny areas

• Underground

• In small areas in the shadow

What does a photovoltaic panel produce?

• Heat

• Thermal energy

• Electricity

• Mechanical energy

What does a photovoltaic panel consist of?

• Solar cells

• Electrons

• A system of tubes

• Photons