Electricity Power

A fan, rated 50 W, uses 5000 J of electrical energy. How long was the fan switched on?

Hint: Find the time.

• 2500 s

• 1000 s

• 100 s

• 25 s

Tags

NGSS.HS-PS3-1

What is the energy source of the power station shown in the diagram?

• Water

• Wind

• Natural gas

• Nuclear fuel
  (Radioactive substances)

Tags

NGSS.HS-PS3-1

Which of the following shows the correct energy change in a hydroelectric power plant?

• Gravitational potential energy --> kinetic energy --> electrical energy

• Kinetic energy --> electrical energy

• Chemical energy --> heat energy --> kinetic energy --> electrical energy

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A generator is a device used to produce electricity.

• True

• False

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

Give one advantage and one disadvantage of using renewable energy sources to generate electricity.

Tags

NGSS.HS-ESS3-2

NGSS.HS-ESS3-4

NGSS.HS-ETS1-3

How many Volts would we need in order to produce a current flow of 10 mA through a 6 MΩ resistor

• 60 V

• 60000 V

• 0.6 V

• a 9V battery should do the trick

Tags

NGSS.HS-PS2-4

Calculate the power generated as a 20 A current flows through a 10Ω resistor?

• 2 W

• 200 W

• 4000 W

• 400 W

What is the resistance of a 75 W bulb with 5 A of current flowing through it?

• 3 Ω

• 15 Ω

• 375 Ω

• Resistance is futile!

What is the power of a 20V bulb with 5A through it?

• 100W

• 100V

• 6.3W

• 6.3A

What is the resistance through a 700 mV bulb with a power of 1 kW?

• 7 Ω

• 4.9 x 10^-4 Ω

• 7 x 10^-4Ω

• 70 Ω