P11 EM 1 - Electric potential

What unit is most convenient for energy use in homes?

• kWh

• J

• kW

• Js

Efficiency is calculated by

• Ein/Eout

• Eout/Ein

• Win/Eout

• Pin/Eout

True or False: All processes are 100%

• True

• False

The conservation of energy says that energy can be

• Created

• Destroyed

• Transformed

• Efficient

How many J are there in a kWh?

• 1000

• 3.6 million

• 360

• 360 thousand

About how power does a laptop take?

• 50 W

• 5 kW

• 5 W

• 400 W

Why isn't a lot of energy stored in the power grid?

• Too much would be needed

• It would violate conservation of energy

• It is impossible

• It would be too expensive

This circuit symbol represents a

• Battery

• Switch on

• Bulb

• Switch off

This circuit symbol represents a

• Battery

• Switch on

• Bulb

• Switch off

Voltmeters should be connected in

• Series

• Parallel