Power and Energy Concept

Demonstrations in Power and Energy

GE watthour meter mounted on a black display board with a 40W incandescent bulb on the left, control switch box in front, and a 13W compact fluorescent bulb on the right
Safety

Power Meter

A household-style watthour meter measures real-time power consumption of various loads. Students observe the disc spin rate change with different devices and learn the relationship between power and energy .
Four globe-style incandescent bulbs labeled 100W, 60W, 60W, and 40W in ceramic sockets on clear acrylic bases, wired in series and powered on; brightness increases from left to right with the 40W bulb glowing brightest
Safety

Power in Series

Four incandescent bulbs of different wattage ratings are wired in series. Students predict which will be brightest, then discover the 40W bulb outshines the 100W bulb — because in a …
Four glass-tube fuses with metal end caps; one has an intact coiled filament, three show darkened glass and broken filaments from blowing

Fuses

Compare intact and blown glass fuses under a document camera or overhead projector to show how excessive current causes heating that melts the fuse filament. The darkened glass in blown …