Electricity Unit Evaluation

Electricity is the movement of:

• Electrons

• Electrons and protons

• Electrons and neutrons

• Electrons, protons and neutrons

Current and static electricity are similar in that they both:

• Require conductors

• Involve the movement of electrons

• Happen in nature

• Perform "work"

Why is this happening?

• The hairs have the same charge and are repelled

• The hairs have the opposite charge and are repelled

• The hairs have the same charge and are attracted to the air

• The hairs and the face have the opposite charge and are repelled

Protons and electrons:

• Attract

• Repel

• Do nothing

• Attract, but only in certain circumstances

When cotton and steel are rubbed together, cotton becomes ________.

• Very positive

• Slightly positive

• Very negative

• Slightly negative

When ebonite and human hair are rubbed together, ebonite becomes ______

• Very positive

• Slightly positive

• Very negative

• Slightly negative

Which of the following is a "fair conductor"?

• Copper

• Human

• Rubber

• Plastic

Which of the following is NOT a principle of static electricity?

• Electrons are free to move

• Protons do not move

• Neutral objects can not be charged

• Friction causes the movement of electrons

If a negatively charged rod is brought close to, but not touching, the metal ball of the electroscope, the leaves will:

• Attract, because they're positive

• Repel, because they're positive

• Attract, because they're negative

• Repel, because they're negative

If a positively charged rod touches the metal ball of the electroscope, the leaves will:

• Attract, because they're positive

• Repel, because they're positive

• Attract, because they're negative

• Repel, because they're negative