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12 replies to this topic

#1 DocBlack

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Posted 19 March 2008 - 11:59 PM

You have two light switches in one room. switch one controls one 240 watt bulb, switch two controls four 60 watt bulbs. You would like to save money on your electric bill, so you decided to only use one switch in the room which one are you going to use and why?
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#2 sandstorm

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Posted 20 March 2008 - 01:20 AM

You would use the four 60 watt bulbs, because, even though the wattage is the same, the four 60 watt bulbs would be distributed throughout the room (I'm guessing) and would therefore light your room more effectively.
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#3 itachi-san

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Posted 20 March 2008 - 01:43 AM

He is not asking whether the room is lit better with one or another... The guy would use the 240 watt bulb, because it costs more to use 4 fixtures over 1 fixture even though they add up to the same wattage.
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#4 EventHorizon

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Posted 20 March 2008 - 02:16 AM

You have two light switches in one room. switch one controls one 240 watt bulb, switch two controls four 60 watt bulbs. You would like to save money on your electric bill, so you decided to only use one switch in the room which one are you going to use and why?


Spoiler for guess

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#5 Jordanmax

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Posted 20 March 2008 - 02:40 AM

Use the 240 watt it has less wasted power. The 4 60's have more power going to each bulb that is wasted.
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#6 DocBlack

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Posted 20 March 2008 - 03:11 AM

You have two light switches in one room. switch one controls one 240 watt bulb, switch two controls four 60 watt bulbs. You would like to save money on your electric bill, so you decided to only use one switch in the room which one are you going to use and why?


Ok, by request i will share a few of the details of this room with you.
There is no window, or any other natural light coming into the room.
The 4 bulbs are in a line on one side of the room
The single bulb in by its lonesome on the other side of the room
You do not have the option to use lower watt bulbs or any other means of light

Take all this into account before answering and then answer using this idea as well
The single bulb is a heat light
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#7 sandstorm

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Posted 20 March 2008 - 03:33 AM

The single bulb is a heat light

So I was right... the four 60 watts are a better use of energy.
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#8 redshift

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Posted 24 March 2008 - 02:40 PM

Ok, by request i will share a few of the details of this room with you.
There is no window, or any other natural light coming into the room.
The 4 bulbs are in a line on one side of the room
The single bulb in by its lonesome on the other side of the room
You do not have the option to use lower watt bulbs or any other means of light

Take all this into account before answering and then answer using this idea as well
The single bulb is a heat light


The single bulb is a incandescent bulb? You haven't given any detail on the wiring so I'm assuming line loss is negligible. I don't know much about the efficiency of lightbulbs but can we assume a linear relationship between lumens and wattage? Are we allowed to unscrew lightbulbs?
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#9 Duh Puck

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Posted 24 March 2008 - 02:54 PM

Ok, by request i will share a few of the details of this room with you.
There is no window, or any other natural light coming into the room.
The 4 bulbs are in a line on one side of the room
The single bulb in by its lonesome on the other side of the room
You do not have the option to use lower watt bulbs or any other means of light

Take all this into account before answering and then answer using this idea as well
The single bulb is a heat light

If saving money is the goal, it's simple. Unscrew a couple of the 60W bulbs and use the second switch. :)

However, based on your tip about the heat light, I would say ...

Spoiler for possible solution

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#10 Martini

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Posted 24 March 2008 - 03:08 PM

It doesn't seem this is a brain teaser but a question about energy efficiency. So at least for now...off to "Others".
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