Vocabulary Examination 17
Test # 17
Login/Register to access massive collection of FREE questions and answers. Login/Register
500 questions in 50 tests. Each test contains 10 questions.
My Account / Test History
Some Uses of Electricity
The incandescent bulbs which illuminate our buildings consist of a fine, hairlike thread inclosed in a glass bulb from which the air has been removed. When an electric current is sent through the delicate filament, it meets a strong resistance. The heat developed in overcoming the resistance is so great that it makes the filament a glowing mass. The absence of air prevents the filament from burning, and it merely glows and radiates the light.
FIG. - An incandescent electric bulb.
Quantitative Aptitude Test