Dear All please do help me out - thanks.

How much heat and light energy is produced by a 100W electric lamp in 5 minutes?
Solutn = I tried this using
Energy = power x time
100 x 5min
= 100 x 300 sec
= 30,000J - Pls do I got the answer?

You will see it easier if you include the units.
1 W=1 J s^-1

So energy produced is

100 W x 300 s
=100 J s^-1 x 300 s
=30000 J

You should note the spacing of the units, and it is 's' not 'secs'. But hey I'm picky.

To DrRuss--I hope you come around often. We need someone with a little organic background. Mine is little, but TOO little (too late).

Yes, you are correct! The answer to your calculation is indeed 30,000 Joules (J). You used the formula Energy = power x time correctly, where the power is given as 100W and the time is 5 minutes.

To solve this problem, you converted the 5 minutes into seconds by multiplying it by 60. So, 5 minutes is equal to 300 seconds. Then you multiplied the power (100W) by the time in seconds (300s) to find the energy produced.

Just a small correction in your solution: You correctly converted 5 minutes to 300 seconds, but you wrote "100 x 300 sec = 30,000J" without explicitly mentioning that J stands for Joules. However, your final answer of 30,000J is correct.

Well done on your calculation!