Unit 5 Electricity and Circuits

What is a circuit?

• an outlet or switch
• a path which an electric current flows
• a poor conductor

What is a switch? 

• part of the toaster that you plug into the wall
• an outlet that gives power
• part of a circuit that starts or stops the electricity

A conductor is ____________

• something that allows electric current to flow easily
• something that limits the flow of electricity

Tags

NGSS.4-PS3-2

A _____________ limits the flow of electricity 

• resistor
• conductor
• circuit

In which of the following circuits will all of the remaining light bulbs go out if bulb 3 burns out?

• 
• 
• 
• 

Tags

NGSS.3-PS2-3

NGSS.4-PS3-2

Which object does NOT conduct electricity?

• copper wire

• iron nail

• salt water

• wood

Tags

NGSS.5-PS1-3

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.

Tags

NGSS.3-5-ETS1-2

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

Diagrams of electric fields and magnetic fields often look similar. What is an important difference between electric field lines and magnetic field lines?

• Electric field lines always point away from the object generating the field, while magnetic lines always point toward it.

• Electric field lines are close together where the electric field is strong, but magnetic lines are close where the magnetic field is weak.

• Electric field lines start and end on charges, while magnetic field lines form closed-loop paths to and from the poles.

• Magnetic field lines cannot cross, while electric field lines can

Tags

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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