Electricity Practice

The electric force between two or more charged objects depends on which of the following quantities?

• charge and distance between the charged objects

• mass and distance between the charged objects

• charge and mass of charged objects

• quantity of charges and their masses

Tags

NGSS.HS-PS2-4

Which object does NOT conduct electricity?

• copper wire

• iron nail

• salt water

• wood

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-6

Irene bought a new house and has decided to rewire it. She wants to be able to turn

some lights off and have the others remain lit. What type of circuits should she use and

why?

• She should use parallel circuits because when one light turns off, the other lights remain lit.

• She should use series circuits because when one light turns off, the other lights remain lit.

• She should use parallel circuits because when one light turns off, the others turn off, too.

• She should use series circuits because when one light turns off, the others turn off, too.

Dissolving salt in water increases the conductivity of the solution because the —

• salt gives the solution a net negative charge

• salt ions bond with the available water molecules

• solution has an increase in kinetic energy

• concentration of ions in the solution increases

Tags

NGSS.HS-PS1-5

An electric current flows in a wire. What is one result?

• a magnetic field is created

• any nearby magnetic fields are destroyed

• nearby magnets lose their strength

• the metal of the wire cannot be affected by magnets

Tags

NGSS.HS-PS2-5

Why must every electric circuit have a voltage source, such as a battery?

• Without a voltage source, the resistance would be too high

• Without a voltage source, the resistance would be too low

• Without a voltage source, there would be no electrons in the circuit

• Without a voltage source, there would be no source of current

What happens if there is a break at any point in a series circuit?

• no current flows

• current flows through an alternative path

• resistance goes to infinity

• current reverses direction

Dave notices that a wire is magnetic and attracts metal objects, What can be concluded about the wire?

• an electric current is passing through it

• heat is passing through it

• radiation is passing through it

• sound waves are passing through it

Tags

NGSS.HS-PS2-5

Why does current flowing through a wire create a magnetic field?

• because magnetic force is another aspect of electrical force

• because the metal in the wire attracts magnets

• because magnets can create electricity

• because the draw of a wire can be stronger than the pull of Earth’s magnetic field

Tags

NGSS.HS-PS2-5

Which of the following would be a good conductor of electricity?

• plastic

• rubber

• cotton

• iron