Electricity

Which of the following are examples of insulators?

• Copper

• Plastic

• Glass

• Aluminum foil

• Pencil lead

Select the items needed to have a complete circuit.

• Energy source (battery)

• Wires

• Energy user (lightbulb)

• Voltmeter

• Switch

If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that

• friction destroyed electrons in the rod.
• the silk has become negatively charged.
• protons have moved to the rod.
• glass attracts more protons.

An object becomes charged when the atoms in the object gain or lose

• electrons
• protons
• neutrons
• all of the above

Is the symbol for _____.

• Light bulb

• Resistor

• Battery

• Switch

In a series circuit, all parts of the circuit are connected in a single path.

• True

• False

The flow of electric charges is

• voltage

• current

• resistance

• electricity

A battery is a source of alternating current.

• True

• False

Objects that have opposite charges

• are attracted to each other, and the force between the objects pulls them together.
• are attracted to each other, and the force between the objects pushes them apart.
• are repelled by each other, and the force between the objects pulls them together.
• are repelled by each other, and the force between the objects pushes them apart.  

Is the symbol for _____.

• Light bulb

• Resistor

• Battery

• Switch