SCI Rev. pt. 2

A particle that has a positive charge.

• Electron
• Proton
• Neutron
• Atom

Electrons and protons ……………. each other.

• Repel
• Attract
• Run
• Push

If the atom has an equal number of protons and electrons, it will have …….……. charge.

• Positive
• Negative
• Unequal
• No

An atom lost an electron. What is the charge of it now?

• Zero
• 1
• -1
• 2

The charges that can build on an object?

• Static electricity
• Current electricity
• Electric discharge
• Electrostatic discharge

The jumping of electrons from one object to another.

• Electric discharge
• Current electricity
• Electrostatic discharge
• Static electricity

The flow of charges in an electric wire.

• Static electricity
• Electric current
• Electrostatic discharge
• Electric discharge

Some materials do not conduct electric current. Which of these materials is an electrical insulator?

• CD case
• Paper clip
• Penny
• Staple

Ariel wants to build an electric circuit with a device that can be turned on and off. Which list contains all of the materials she needs for her circuit?

• Wire, ruler, switch, battery
• String, buzzer, battery, switch
• Buzzer, wire, switch, light bulb
• Battery, wire, light bulb, switch

A boy walks across a carpet on a cold day. Then he starts to touch a doorknob, and a spark jumps from his finger to the doorknob. If the boy’s hand has a negative charge, what is the charge on the area of the doorknob close to the boy’s hand?

• Negative
• Neutral
• Positive
• Both positive and negative