Lightbulb

[Abi]

Ok, very odd question here. But someone more clever than me might know the answer!

My light uses a 100W bulb. And my lamp uses a 60W bulb. So the lamp uses less electricity, doesn't it?

Or does the Watts have nothing to do with that?

Damn, i should have done more in physics than gossiping at the back... :cool:

[Abigail]

There is a way to work it out. Watts are basically joules of energy so 100J and 60J. Can't remember the formula but I'm pretty sure the lamp uses less electricity.

Electricity was the one physics A level paper that I passed and I still can't remember the formula :lol: It will come to me.

[sindydoll]

i always use 100w bulbs in my house! i like it bright

[Jojo]

energy (kWh) = power (kW) × time (h)

Whichever appliance is using the 60W bulb would be the cheaper option, I think, if used for the same amount of time.

I have found a GCSE revision website which is pretty clear on working it out here (http://www.gcse.com/energy/kWh.htm)

[Abi]

Ah cool, thanks everyone. I hated Physics, never did any work, couldn't wait to drop science in all forms, and was very surprised to get BB :p

[Kim]

I had to do this for my Physics exam which was the last one. I couldn't even remember it. I hated Science for the last year too and my mum wondered how much I'd paid the examiner when I got an A in it. :lol:

All I know is that my light in my room had to have a 60W bulb with the last lampshade because 100W would be too bright due to the type of lampshade that I had.

[di marco]

i always hated physics too, i cant remember anything from it!