Hi I have 2 light bulbs, one says 11W and one says 15W, does that mean the 11W uses less electricity?

Question

Hi I have 2 light bulbs, one says 11W and one says 15W, does that mean the 11W uses less electricity?

Answer 1

11 Watts means it is transferring 11 Joules of electrical energy into light and heat energy each second.  The 15 Watt transfers 15 Joules of electrical energy each second.

If as is likely these are energy saving bulbs then they transfer a greater percentage of the electrical energy into light and less into heat when compared with a 'filament' old fashioned bulb.

Answer 2

yes, the 11 W bulb will use less electricity but also produce less light when compared to 15 W bulb. hope this is helpful. bye.

Answer 3

yes it uses 4 less watts then the other

Answer 4

You betcha!  It uses 3 Joules less energy per second.

-Fred

Answer 5

yes it uses 4 w less per 'x' amount of given time. but it emits a slightly duller glow

Answer 6

It indicates the brightness of the bulb i.e. 15W is brighter than 11W

Answer 7

Yes. The Watt (W) is a unit of power.

It is defined as the amount of energy (Joules) used per second (not per hour as some have stated)

A Joule is the energy required to move an electric charge of one coulomb through an electrical potential difference of one volt.

Basically the lower the wattage, the less electricity it uses.

This does not necessarily mean that the 11W light bulb is the dimmer (although it probably is). The 11W bulb could be more efficient (less power, more light).

Answer 8

Yes. The wattage factor of a light bulb tells you how much electricity it uses. It also tells you how much light it will emit. Lower wattage light bulbs are dimmer.

Answer 9

yes

I guess these are energy-saving fluorescent bulbs, the 15 will be brighter than the 11.

The 15 will also be brighter than the old-type incandescent 40w, so it depends on the type of bulb as well as the w

Answer 10

Yes, you are right. The 11 w bulb uses 11joule/hour.

Ye other one use 15 joule/hour.