Circuits #3

Which of these best completes the circuit?

• rubber band

• metal nail

• leather shoelace

• wooden toothpick

Electrical lights will not come on unless their electrical circuit is a --

• parallel circuit

• series circuit

• closed circuit

• short circuit

Which of these substances conducts electricity the best?

• wood

• brick

• copper

• plastic

What material would be safest to use as an insulator to cover electrical wires?

• rubber

• tin

• aluminum

• water

Will the light bulb in this circuit light and why/why not?

• yes, because it has two batteries

• no, because the switch is open

• yes, because it is in a circuit

• no, because the bulb is burned out

Which light will be brighter and why?

• Bulb A because its circuit is closed

• Bulb B because its circuit is closed

• Bulb B because it has more volts

• Bulb A because it has less volts

This is an example of a/an:

• Closed circuit

• Open circuit

What BLOCKS THE FLOW of electricity through it?

• Conductors

• Insulators

• Resistors

How many lightbulbs will work if there is a break in the circuit at POINT A?

• 1

• 2

• 3

• NONE

How many lightbulbs will work if there is a break in the circuit at POINT B?

• 1

• 2

• 3

• NONE