Question 724589
you are an electrician working in an industrial plant.
 A circuit contains 8 incandescent lamps connected in series across 480 volts.
 One lamp has burned out, and you must determine which one is the defective.
 You have available a voltmeter, ammeter, and ohmmeter.
 Which meter would you use to determine which lamp is defective in the shorter possible time? Explain how you use this meter and why
:
I think the best and safest way is to use an ohmmeter
:
Turn off the power, Check continuity between lamps 4 & 5 to one end of the line of lights.
 If continuity is shown, the defective lamp is among the other 4 lamps.
Check from the that middle point across two lamps on the open side. 
Then across the two remaining lamps to determine which one is open.