Electric Current

Which of the following is the best example of an electrical conductor?

• tire

• steel

• plastic

• none of the above

Which best briefly summarizes the law of electric charges?

• charges always attract

• charges always repel

• unlike charges attract

• unlike charges repel

Which of the following statements is correct about conductor and insulator?

• the electrons in conductor do not move around

• the electrons in insulator do not move around

• the electric current can pass through the insulator

• the electric current can pass through both insulator and conductor

Electric circuit is a path for transmitting electric current

• true

• false

What is the main difference between parallel and series circuits?

• in series circuit, charges flow one path; charges in parallel circuit flow in multiple paths

• in series circuit, charges flow multiple paths; charges in parallel circuit flow in one path

• in parallel circuit, several lamps work separately; in series circuit, several lamps work independently

• in parallel circuit, if one lamp breaks then the other lamps will also off; in series circuit, if one lamp breaks then the other lamps still works

What kind of circuit is this?

• series

• parallel

If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?

• neutral charged

• positively charged

• negatively charged

• no charges at all

A ______ opens and closes a circuit.

• cell

• conductor

• wire

• switch

What is this symbol for?

• light bulb

• wire

• cell

• battery

When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in parallel.

• true

• false