40 watts is 40 watts, that is what you are paying for. However, an incandescent bulb uses the 40 watts to make light and heat. The compact bulbs make more light and less heat for the same wattage. To actually save, choose a lower wattage that will give acceptable light levels.
The fulform of CFL bulbs is compact fluorecent light
The link shown below to Wikipedia explains pretty well how a compact fluorescent lamp works.
To answer this question the voltage has to be given. I = W/E. Amps = Watts/Voltage.
well one is spelled differently than the other
The prices for compact fluorescent lamps vary in price depending on size, where you buy them, and what materials they are made of.
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps. The lamps use a tube which is curved or folded to fit into the space of an incandescent bulb, and a compact electronic ballast in the base of the lamp.
a compact electronic ballast in the base of the lamp
Yes, you can you use compact fluorescent bulbs in a garage door opener's lamp holder.
"Compact fluorescent lamps" (or, more commonly CFLs) sold direct to consumers for installation in a standard screw-in socket have an integral ballast built into the base. The ballast converts and controls the line voltage from the socket to properly drive the fluorescent lamp. Ballasts are generally fairly complex circuitry. All fluorescent lamps require a ballast. However, most lamps used commercially ("ordinary fluorescent lamps") do not have the ballasts built into them; rather, the ballasts are hidden somewhere in the fixture.
Canadian Football league. Compact Fluorescent Lamp.
A compact fluorescent light (CFL) is a fluorescent light that is manufactured in the approximate size and shape of a standard incandescent lamp. It's got an electronic ballast (unlike the standard fluorescent lamp tube which uses a heavy wire wound ballast), and it screws into a socket and performs on the standard line voltage like that aforementioned incandescent lamp. The light emitting diode (LED) is a solid state device that converts electricity into light without heating a filament like the incandescent lamp, or ionizing a gas like the fluorescent light does.
A compact fluorescent light (CFL) is a fluorescent light that is manufactured in the approximate size and shape of a standard incandescent lamp. It's got an electronic ballast (unlike the standard fluorescent lamp tube which uses a heavy wire wound ballast), and it screws into a socket and performs on the standard line voltage like that aforementioned incandescent lamp. The light emitting diode (LED) is a solid state device that converts electricity into light without heating a filament like the incandescent lamp, or ionizing a gas like the fluorescent light does.