1.a device that automatically blows out when there's short circuit
a. fuse
b. circuit breaker
c. main switch
d. push button


2.a device that automatically cut off the current when a short circuit or an overload happens.
a. fuse
b. circuit breaker
c. main switch
d. charger


3.electricity produces a magnetic effect in_____
a. good plating
b. magnetic crane
c. remote control
d. LED bulb



4.which of the following materials considered the best conductor of electricity?
a. silver
b. gold
c. copper
d. aluminum


5.the best known insulator is asbestos with a resistivity percentage of
a. 100%
b. 80%
c. 90%
d. 95% ​