2nd Quarter Review

What increases and decreases voltage?

• voltmeter
• generator
• transformer
• barometer

What type of simple machine is the claw end of a hammer?

• ramp
• pulley
• wheel and axle
• lever

What is the source of energy in a simple light bulb circuit made in the classroom?

• battery
• wires
• light bulb
• switch

The sun beats down on a solar panel all day so you can power your house at night. What kind of energy is inside the solar panel?

• chemical energy
• kinetic energy
• electrical energy
• mechanical energy

What are the three main parts of an electrical power grid?

• boilers, condensers, turbines
• dams, generators, turbines
• hydroelectric plants, solar power plants, nuclear power plants
• power stations, transmission lines, transformers

How does a generator produce electricity?

• Using batteries
• By burning fossil fuels to create energy
• Spinning a copper coil between two magnets to produce an electric current
• splitting atoms to create nuclear fission

Solar Cells can be used to power a radio. Which option describes the energy transformation in this process?

• solar energy>chemical energy>electrical energy>sound energy
• solar energy>electrical energy>chemical energy>sound energy
• solar energy>chemical energy> mechanical energy> sound energy
• solar energy> mechanical energy>chemical energy>sound energy

Joe has a toy boat powered by batteries. When the switch is on, the boat moves. The energy transformations that take place in the toy boat are shown below:
chemical energy>>X>>mechanical energy
What form of energy is X?

• heat energy
• light energy
• sound energy
• electrical energy

Suzy is pushing a speaker up a stage ramp instead of lifting it up. How does this help Suzy?

• It reduces the size of the speaker.
• It alters the directions of force applied
• It helps move the speaker in minimum time.
• It reduces the amount of force required to lift the speaker.

What is an example of work being done?

• Pushing a shopping cart across the parking lot
• holding a 10 lb baby for ten minutes
• pushing a 10,000 lb rock and not moving it at all
• standing on one foot for 30 seconds