Physics, 11.11.2019 22:31 aziah86

Acircuit contains two light bulbs connected in parallel. what would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?

a. the brightness of each bulb would decrease because the total resistance of the circuit would decrease.

b. the brightness of each bulb would increase because the total resistance of the circuit would increase.

c. the brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.

d. the brightness of each bulb would remain the same even though the total resistance of the circuit would increase.

Answers: 2

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Answer from: Lugo7006

Answer;

C. The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.

Explanation;

-If light bulbs are connected in parallel to a voltage source, the brightness of the individual bulbs remains more-or-less constant as more and more bulbs are added to the circuit.

-The current increases as more bulbs are added to the circuit and the overall resistance decreases. In addition, if one bulb is removed from the circuit the other bulbs do not go out. Each bulb is independently linked to the voltage source

Answer from: kristinmonkey

Answer;

C. The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.

Explanation;

-If light bulbs are connected in parallel to a voltage source, the brightness of the individual bulbs remains more-or-less constant as more and more bulbs are added to the circuit.

Answer from: kels7618

In order to say definitely what would happen, we need to make sure that
the light bulbs are the only items connected to the battery or power supply.
What I mean is: You can't start out with, say, a string of Christmas tree
lights, and at some point in the string, there's an extra little bulb in parallel
with one of the lights in the string. If that's the situation ... if there's anything else in the circuit besides the two light bulbs in parallel ... then we'd need
more information in order to predict what happens when we make changes
to that part of the circuit.

So the whole circuit consists of:
Two light bulbs in parallel, connected to a battery. That's all.

Now, we connect two MORE light bulbs in parallel with the first ones.
Now we have FOUR light bulbs, all in parallel, connected to the battery.

-- The battery would see the total resistance of the circuit DECREASE.
(An electron that leaves one terminal of the battery now has 4 ways to
reach the other side of the battery, instead of just two. It's easier for
electrons to get there, so more of them make the trip every second.)

-- Did you hear that ? "More electrons make the trip every second."
That means there's more current leaving the battery.

-- IF the battery or power supply is able to deliver the increased current,
then the original devices ... the original two light bulbs ... don't even know
that anything has happened. Their brightness doesn't change.

-- Choice-C says this.

I just told you that connecting more stuff in parallel makes no difference
to the devices that are already there. If that sounds weird to you, then
let me tell you this:

EVERYTHING in your house is in parallel with everything else !
Every light, kitchen appliance, motor, heater, electric furnace, radio,
air conditioner, phone charger, TV, computer, mixer, microwave ...
everything that plugs into a socket in the wall ... is in parallel with
everything else that you plug in.

When you plug in something new, or turn on something that was off,
it should have no effect on the things that were already running.
(If it does ... if, say, the lights in kitchen go dim when you turn on
the microwave ... then the wiring in your house is a little bit skimpy
for running all the things that we run in our houses now.)

Answer from: Quest

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like $\frac{1}{3}$ . (i crazy)

most famous scientist who contributed to this physics are:

max planckalbert einsteinerwin schrödingermany

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

superposition (where 1 thing can be this and that at the same time),entanglement (where two particles are seemingly connected by some sort of unknown (or known) force, energy, matter (i know all that can be the same at least it was at the beginning)

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

Answer from: Quest

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod. this generates an electric current in the coil, which powers the bulb.