12. Silver, copper, aluminum and steel are conductors. What are conductors?
a. They are devices that open and close a circuit
b. They are materials which allows the flow of electricity circuit
c. They are materials that do not allow electricity pass through

13. What are insulators?
a. They are materials that do not allows electric current to pass through
b. They are source of electrical energy in a circuit
C. They are materials that allow electric current to pass through

14. A device that open and close a circuit is
a. switch
b. fuse
c. source

15. Identify the source from the following
a. bulb
b. wire
c. dry cell
pasagot po nang maayos ​