Andy Catoe
New member
what is the current drawn by a 250 watt incandescent lamp operating at 120 volts
electrical
- Thread starter Andy Catoe
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al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: electrical
This sounds like an exercise question.
Let me ask you. . .what is the formula that relates power (in Watts) to Volts and Amps?
Therein, with a little arithmetic, lies the calculated answer.
Spelling will be my downfall -- Al
[ August 21, 2005, 04:32 PM: Message edited by: al hildenbrand ]
This sounds like an exercise question.
Let me ask you. . .what is the formula that relates power (in Watts) to Volts and Amps?
Therein, with a little arithmetic, lies the calculated answer.
Spelling will be my downfall -- Al
[ August 21, 2005, 04:32 PM: Message edited by: al hildenbrand ]
bphgravity
Senior Member
- Location
- Florida
Re: electrical
In a purely resistive circuit, A = W / V.
In a purely resistive circuit, A = W / V.
- Location
- Massachusetts
Re: electrical
We are not doing your homework, tell us what you come up with and we can help you.
That would be Amperes.
We are not doing your homework, tell us what you come up with and we can help you.
- Location
- Massachusetts
Re: electrical
I am with you Bryan, that is clear to me.
peter d
Senior Member
- Location
- New England
Re: electrical
I don't need no stinking Omez Law! I just do what my journeyman tells me!
I don't need no stinking Omez Law! I just do what my journeyman tells me!
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
Re: electrical
I thought we were talking about "home slaw." I like home slaw. My doctor told me I needed more fiber in my diet.
I thought we were talking about "home slaw." I like home slaw. My doctor told me I needed more fiber in my diet.
physis
Senior Member
Re: electrical
Ohm's law has three diffrent forms that are all the same thing, just rearranged algebraicly.
V=IR
R=V/I
I=V/R
V is Voltage (volts)
R is Resistance (Ohms)
I is Current (amps or Amperes)
Power is measured in watts and is the product of voltage and current and can also be written in three ways:
P=VI
V=P/I
I=P/V
What you have to do is find which form of the two basic equations, (V=IR and P=VI, all six forms are here), work with the information you have.
Edit: It helps to know that any equation AB=C can be rearranged in these three ways.
[ August 23, 2005, 07:57 PM: Message edited by: physis ]
I'll help you out Andy.
Ohm's law has three diffrent forms that are all the same thing, just rearranged algebraicly.
V=IR
R=V/I
I=V/R
V is Voltage (volts)
R is Resistance (Ohms)
I is Current (amps or Amperes)
Power is measured in watts and is the product of voltage and current and can also be written in three ways:
P=VI
V=P/I
I=P/V
What you have to do is find which form of the two basic equations, (V=IR and P=VI, all six forms are here), work with the information you have.
Edit: It helps to know that any equation AB=C can be rearranged in these three ways.
[ August 23, 2005, 07:57 PM: Message edited by: physis ]
- Location
- Lockport, IL
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- Retired Electrical Engineer
Re: electrical
Of course you did. The correct answer is "red."
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: electrical
Huh?
Huh?
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
Re: electrical
You are right, "boss," it was. It was my attempt at sick engineering humor. :roll:
I would be curious to learn what "they" thought the correct answer to be. But Peter didn't get the job (probably lucky for Peter), so we'll likely never know.
You are right, "boss," it was. It was my attempt at sick engineering humor. :roll:
I would be curious to learn what "they" thought the correct answer to be. But Peter didn't get the job (probably lucky for Peter), so we'll likely never know.
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: electrical
Peter's test experience is one of those things that gets my back up.
Peter's test experience is one of those things that gets my back up.
cselectric
Senior Member
- Location
- Wisconsin
Re: electrical
Perhaps a trick question. I can't say I've ever seen a 1200 watt incandesant lamp. If it were a HID lamp of some sort, you would have to consider the ballast, which would change the numbers a bit. Then again, I don't recall ever seeing a 1200 watt lamp of any sort, so maybe they're just insane. :roll:
cselectric
Senior Member
- Location
- Wisconsin
Re: electrical
OK, so maybe I'm the one who's insane.
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