Afluorescent light bulb is one example of an /efficient) device.

A fluorescent light bulb is one example of an energy "efficient" device.

Explanation:

Consider the provided information:

The fluorescent light bulb contains electrodes at both ends also it contains argon gas and mercury vapor is inside the bulb.

The fluorescent light bulb produced less heat and can produced 50 to 100 lumens per watt.

Thus, a fluorescent light bulb is one example of an energy efficient device.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.