Electricity and magnetism review

Which of the following is true about the difference between a series circuit and a parallel circuit?

• a series is composed of multiple paths while a parallel circuit only has one
• only a series circuit can supply power
• all parallel circuits require a switch
• in a series circuit, when one bulb breaks all the bulbs break

Which of the following will increase the current in a circuit?

• Changing the battery from a 9V to a 12V
• increasing the length of the wire
• making the wire more narrow
• using aluminum wire instead of copper wire

An electric current requires all of the following except:

• Resistor
• power source
• conductor
• switch

The diagram below shows a simple circuit. Which of the following is true:

• If we cut the wire, the current will still flow and light the bulbs
• if the first bulb goes out the other two will remain lit
• an example of this type if circuit would be christmas lights

Anna wants to be able to pick up a spoon with her electromagnet. Which of the following would increase the strength of the magnetic field.

• use a lower voltage battery
• reverse the polarity
• use an insulator instead of a nail
• increase the number of coils around the nail

Any material that allows the flow of electrons (electricity) to move through it easily is known as...

• insulator
• circuit
• generator
• conductor

Savannah has a compass that is refusing to point north. What could be nearby causing her compass to malfunction?

• heat energy
• a strong electric current
• gravitational force
• light energy

When resistance increases current will....

• decrease
• remain the same
• match the resistance
• increase

All of the following INCREASES resistance EXCEPT:

• lengthening the wire
• increase the wire thickness
• using a poor conductor
• decreasing current

Like charges _________ while opposite charges_____________.

• attract; repel
• repel; repel
• attract; attract
• repel; attract