answersLogoWhite

0


Best Answer

This light bulb may be on the same line as the vac. 1. Even if the dry vac is, let's say 300W, when it starts up it uses at least twice as much energy. If light dims and then goes back to normal, it's perfectly normal. 2. When light bulb dims and stays dim while operating dry vac, unplug it and never use in the same room again; it uses too much energy for the size of the wire and can cause overheating of wiring and fire! == == <><><> If the wiring is modern, check the connections on every device on that breaker or fuse. If you have a meter check the voltage at the receptacle with the vac and the light. <><><> There are two possibilities, depending on the details of the fault:

1) The bulb dims momentarily when you start the vacuum, then returns to normal brightness even while the vacuum is operating.

This is normal, as previously stated. The reason for this is that the limiting factor to current flow in a motor is the counter-voltage created by the running motor. [It actually works as a generator!. If you jam the motor so it cannot turn, the current flow through what is now an unimpeded conductor can be high enough to trip the circuit protective device!] ... and reduce the available voltage to any parallel connected device to the voltage across the motor! In this case, the resistance value of your circuit conductors can be the only significant load on the circuit [low resistance=high current!]

2) The bulb dims and stays dim throughout the operation of the vacuum.

There is something wrong with the circuit ... loose connection, partially open service neutral, partially broken wire, bad plug, dodgy breaker, etc. ... and the defect is part of the load, causing a voltage drop across the defect and your series connected motor! [voltage drop=energy usage=heat at the defect]

In this case, the bigger the load, the worse it looks!

User Avatar

Wiki User

โˆ™ 2008-11-05 11:36:19
This answer is:
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
User Avatar
Study guides
๐Ÿ““
See all Study Guides
โœ๏ธ
Create a Study Guide

Add your answer:

Earn +20 pts
Q: What causes an overhead light bulb to dim when a small dry vac is plugged into a wall outlet in the same room and turned on?
Write your answer...
Submit
Related questions

My laptop won't turn on and it looks like it's plugged in Is it dead?

If your laptop is turned on and it looks like it's plugged in, the batter could possibly be dead or the connection from the outlet to the computer has a problem.


If a 110 window ac was plugged into a 220 outlet and it ran then we turned it off and now it gets no power so what went bad?

You cooked it


What happens when a lamp plugged into an electrical outlet is turned on?

the form of energy changes and the total of energy increases


What energy transformation is it when a toaster is being plugged into an electrical outlet?

Nothing YET- but when the toaster is turned on, electrical energy is changed to heat (and a little light)


Does a cell phone plugged into a car port drain the battery after the car is turned off?

If the outlet is powered with the key off, then yes it will slowly drain the battery.


What does the key symbol mean on a 2006 Chrysler PT Cruiser power outlet?

That the outlet only has power when the ignition is turned on.That the outlet only has power when the ignition is turned on.


A hair dryer uses 1.2 kW of power when it is plugged into a 120V outlet and is turned on What is the current taken by the hair dryer?

The formula you are looking for is I = W/E. W = kW x 1000.


Is it ok to answer your cell phone when it is plugged into an electrical outlet?

it is not recommended to use your cell phone when charging, this could cause the circuits to short. Ideally you should charge your battery when your phone is turned off


In your living room you have a lamp The lamp is plugged into an outlet that connects to a switch If the lamp is manually turned off but the switch is still flicked on are you wasting electricity?

No electricity can be used or wasted if the lamp itself is turned off. It makes no difference if it has been turned off at the wall outlet or at the lamp itself. It is the same situation as a flashlamp that has a light bulb supplied by a battery. If the flashlamp is switched off the battery inside it is still there, waiting to feed the light bulb with current, but the current can only flow into the light bulb when the switch on the flashlamp is turned on.


Why wont my central heating start when the termostadt is turned up?

Furnace blower plugged in, to a live outlet? Fuel (natural gas or oil) is sufficient? If your thermostat has a battery, you may need to replace the battery; that happened to me last year.


Does your appliance use power if it's plugged in but turned off?

It actually does a little bit, but not as much as being turned on.


What causes engine cutting in a 1984 350 Chevy engine only at beginning of acceleration and sometimes backfire when key is turned off?

It's lean. Could be something plugged in the carb.


How do electric moters work?

...generally very well, when plugged in a turned on.


A 60 Watt appliance is plugged into a 120 Volt AC outlet How much current is the appliance drawing when it is turned on?

Amps (current) times volts = watts. so watts divided by volts = current (Amps). i.e.- 0.5 Amps.


What can be turned on or off in your airplane seat?

Overhead light or "Reading Light"


Can you leave things plugged into the cigarette lighter of a car if they're turned off?

Assuming the question was meant to be "Can you safelyleave things plugged into the cigarette lighter of a car if they're turned off?" - the answer is yes.


What type of energy is a lamp plugged in and turned on to light a dark room?

Electrical


Do appliances still use electricity when plugged in but turned off?

yes/yea


What causes electrons to flow when switch is turned on?

An electric field causes electrons to flow when a switch is turned on.


What causes electrons to flow when a switch is turned on?

An electric field causes electrons to flow when a switch is turned on.


What causes electrons to flows when a switch is turned on?

An electric field causes electrons to flow when a switch is turned on.


Do appliances use electricity by just being plugged in and not turned on?

yes it does use energy. My straightener uses energy when it is plugged in, but not on. What i have learned to do is unplug all the things that don't need to be plugged in. If u think that something needs to stay plugged in then leave it in but if it doesn't my best advise is to unplug it!


Make a sentence for the word 'overheard'?

The teacher turned on the overhead for her class to copy the notes.


Does leaving a television plugged into a socket but not turned on is it using electricity?

Not when the stand-by is also turned off. Yes, that uses electricity if the device is left on standby.


What is an electrical bulb?

Bulbs are things that are plugged into light sockets, and they light up when the electricity is turned on.