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 PS-27 Main Page Map Exhibits Resources Feedback |
.jpg) Primary Science Learning Experience PS–27 Electricity Into Heat & Light  TRY THIS Press the button. Touch the cylinder's sides. Try different heights and the top. What do you feel? Why? WHAT IS HAPPENING The bulb lights when electricity flows through it. The bulb's filament converts electrical energy into light and heat. Light (energy) is visible to our eyes. Heat reaches your hands in 3 ways: radiation, conduction and convection. You feel the heat soonest on the walls nearest the bulb. It is less warm farther up because it takes time to conduct the heat up the walls. The bulb warms the air around it. Hot air rises, creating convection currents. These air currents "carry" away the heat, to the insides and to the top. The rising hot air can be felt directly through the holes at the top. 
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