# Electric bulb power

Ezio3.1415
Suppose I have 10.2 W power source... Now how many 1 W bulb can I use here?

Obviously I can use 10 bulbs at their best here... But can I use an eleventh one? Usually we do it like this 10.2/1=10.2~10 but my ques is there is some power left here... So why can't we use one more?

This will result in that bulb glowing dim? I am thinking maybe all of the 11 bulb will then glow dimmer... Maybe that's why we always take the floor of the number we get...

Am I right?

Mentor
Suppose I have 10.2 W power source... Now how many 1 W bulb can I use here?

Obviously I can use 10 bulbs at their best here... But can I use an eleventh one? Usually we do it like this 10.2/1=10.2~10 but my ques is there is some power left here... So why can't we use one more?

This will result in that bulb glowing dim? I am thinking maybe all of the 11 bulb will then glow dimmer... Maybe that's why we always take the floor of the number we get...

Am I right?

You are correct -- adding the last bulb will pull down the voltage of the power source, which will dim all of the other bulbs a little bit.

Ezio3.1415
Thank you...