Keep the Same Energy!
Power Up
Open/Closed
Leave the Lights On
100

  1. A hair dryer has an energy input of 1,500 J and gives out 1,200 J of useful energy. What is the efficiency of the hair dryer?

    1. 80% efficient

    2. .8% efficient

    3. 1.25% efficient

    4. 300% efficient

80% efficient

100

  1. In a house, why is it possible to have the lights turned on in one room, and the lights off in another room?

    1. because in a house a series circuit is used to allow electrons to flow

    2. because in a house a parallel circuit is used to allow electrons to flow

    3. because in a house an open circuit is always used to allow electrons to flow

    4. As long as there is some sort of circuit in the house, this is possible.

Because in a house a parallel circuit is used to allow electrons to flow

100

  1. What is the purpose of a wire in a circuit?

    1. to give off light energy

    2. to turn on and off the light

    3. to power the light

    4. to allow electrons to flow through the circuit

to allow electrons to flow through the circuit

100

  1. A student sets up a series circuit with 3 light bulbs connected to the same power source. If the student removes one of the three light bulbs, what will happen?

    1. The two light bulbs will continue to shine because the circuit is still closed.

    2.  The two light bulbs will continue to shine because they are still connected to their power source.

    3. The light bulbs will not shine because the circuit is now open.

    4. The light bulbs will not shine because the power source has been removed.

The light bulbs will not shine because the circuit is now open.

200

  1. A computer has an energy input of 10,000 J and gives out 7,000 J of useful energy. What is the efficiency of the computer?

    1. 70% Efficient

    2. 14.28% Efficient

    3. 0.7% Efficient

    4. 50% Efficient 

70% efficient

200

  1. The movement of negatively charged electrons in a complete circuit with a lamp and battery is shown to the right. Which statement best explains the movement of these electrons?

    1. Positive charges are not attracted to negative charges

    2. Positive charges are not attracted to positive charges

    3.  Negative charges are attracted to positive charges

    4. Negative charges are attracted to negative charges

Negative charges are attracted to positive charges

200

  1. A student is trying to create an electrical circuit but accidentally leaves the switch open and realizes the light bulb won’t turn on. Why does this occur?

    1. Because there are no electrons if the switch is open

    2. Because the electrons are not able to reach the positive side of the battery if the circuit is open

    3. Because if the circuit is open, there is no battery

    4. Because the open circuit causes the electrolyte to no longer function

Because there are no electrons if the switch is open

200

  1. When you turn the light switch in your house off, which of the following most accurately explains what is happening?


    1.  The light switch has changed the power source.

    2.  The light switch has changed the directions that the electrons are moving.

    3. The light switch has closed the circuit so the lights go off.

    4. The light switch has opened the circuit so the lights go off.

The light switch has opened the circuit so the lights go off.

300

  1. In the image to the right, what would the point W be? 


    1. Where potential energy is the lowest

    2. Where kinetic energy is the highest

    3. Where potential energy is the highest

    4. Where kinetic energy and potential energy are equal




Where potential energy is the highest

300

  1. What type of energy is used when you swim?

    1. Light energy

    2. Potential energy

    3. Heat energy

    4. Mechanical energy

Mechanical energy

300

Closed circuit

300

  1. What type of energy is displayed when thunder rumbles?

    1. Light energy

    2. Sound energy

    3. Electrical energy

    4. None of the above

Sound energy

400

  1. A boulder begins rolling down a hill. Which of the following answer choices is the most accurate?

    1.  Potential energy is decreasing and kinetic energy is increasing.

    2.  Potential energy is increasing and kinetic energy is increasing.

    3.  Potential energy is decreasing and kinetic energy is decreasing.

    4.  Potential energy is increasing and kinetic energy is decreasing.

Potential energy is decreasing and kinetic energy is increasing.

400

  1. What type of energy powers a blender?

    1. Light energy

    2. Sound energy 

    3. Electrical energy

    4. Chemical energy

Electrical energy

400

Open system

400

  1. What type of energy are batteries used for?

    1. Electrical energy

    2. Light energy

    3. Chemical energy

    4. All of the above 

Electrical energy

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