Re: Does Your Car Radio Burn A Lot of Gas?
Posted by:
I just told you
()
Date: September 25, 2021 01:50AM
So again, non-physicist… Wrote:
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> Incorrect Wrote:
> --------------------------------------------------
> -----
> > You just don’t get it Wrote:
> >
> --------------------------------------------------
>
> > -----
> > > Let's suppose Wrote:
> > >
> >
> --------------------------------------------------
>
> >
> > > -----
> > > > Ok I’ll explain Wrote:
> > > >
> > >
> >
> --------------------------------------------------
>
> >
> > >
> > > > -----
> > > > > Explain this to me Wrote:
> > > > >
> > > >
> > >
> >
> --------------------------------------------------
>
> >
> > >
> > > >
> > > > > -----
> > > > > > OK, where do the volts come from Wrote:
> > > > > >
> > > > >
> > > >
> > >
> >
> --------------------------------------------------
>
> >
> > >
> > > >
> > > > >
> > > > > > -----
> > > > > > > LC7JJ Wrote:
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> --------------------------------------------------
>
> >
> > >
> > > >
> > > > >
> > > > > >
> > > > > > > -----
> > > > > > > > My car radio runs on electricity.
> > Not
> > > > gas.
> > > > >
> > > > > > So
> > > > > > > it
> > > > > > > > don't burn no gas.
> > > > > > >
> > > > > > > Yes, it does "burn gas". The
> > electricity
> > > > it
> > > > > > runs
> > > > > > > on is generated by your alternator
> > which
> > > is
> > > > > > turned
> > > > > > > by your engine which runs on gas. So
> > it
> > > > > burns
> > > > > > > gas.
> > > > > >
> > > > > > Help me understand that one. The
> > > alternator
> > > > is
> > > > > > driven by the drive belt. Its speed of
> > > > > operation
> > > > > > is governed by the speed of the engine.
>
> > I
> > > am
> > > > > > assuming a normally functioning car
> > without
> > > > > > excessive electrical demands.
> > > > > >
> > > > > > The A/C affecting gas mileage I
> > understand.
> > >
> > > > > The
> > > > > > A/C compressor clutch minimizes
> friction
> > on
> > > > the
> > > > > > drive belt when the A/C compressor is
> not
> > > > > working.
> > > > > > the alternator does not have a clutch
> > that
> > > > > > disengages the alternator when
> electrical
> > > > > > generation is not needed. The
> > alternator's
> > > > > > "clutch" instead allows the alternator
> to
> > > > > continue
> > > > > > to spin at higher speeds when the
> engine
> > > > speed
> > > > > > suddenly decelerates. So where is the
> > > source
> > > > > of
> > > > > > increased friction from increased
> > > electrical
> > > > > > generation that would affect gas
> mileage.
> > > > > >
> > > > > > I am assuming a normally operating car
> > and
> > > > that
> > > > > > the total electrical demands are not
> > > > excessive.
> > > > >
> > > > > Ok energy is conserved. You don’t get
> > > > something
> > > > > for nothing. When there is more power
> drawn
> > > > from
> > > > > the alternator, it takes more energy to
> > turn
> > > it.
> > > >
> > > > > There is no free lunch. If you draw
> energy
> > > > from
> > > > > that energy from that engine whether
> it’s
> > > in
> > > > > motion or electricity it will come from
> the
> > > > > gasoline.
> > > > > You’ve ever taken physics. Or you’ve
> > > never
> > > > > built a generator. If you have a hand
> > cranked
> > > > > generator, you can hook it up to a 100
> way
> > > draw
> > > > or
> > > > > a 200 watt draw. You have to crank
> harder
> > > for
> > > > the
> > > > > 200W draw.
> > > >
> > > > For a moment, say you decide you want to
> > > amplify
> > > > the shit out of your radio. You install a
> big
> > > ass
> > > > amp and 2 competition 12 subwoofers, when
> the
> > > bass
> > > > hits does your engine rpm go up? Lmfao of
> > > course
> > > > not, the headlights and dash lights will
> dim
> > > > because wait for it, the alternator can't
> > > > magically pull more from the motor to meet
> > the
> > > > demand. So in order to correct this you
> need
> > to
> > > > either...
> > > > Install a larger custom alternator for the
> > > load,
> > > > or...
> > > > Install a capacitor to store the excess
> > > > electricity generated by the alternator
> when
> > > the
> > > > bass doesn't hit.
> > > > Go the fuck back to physics class son.
> > >
> > > The energy going into the speakers has to
> come
> > > from somewhere. It comes from the gasoline in
> > the
> > > tank. Where else did it come from? The
> energy
> > > that the speakers used is not available to
> move
> > > the vehicle. So you get poorer gas mileage if
> > the
> > > speakers are blasting.
> > >
> > > You’re the one who needs to study physics.
> >
> > The alternator does not have any control on the
> > rpm, it is static, not dynamic. It can not
> speed
> > up the motor and affect mileage. It has the
> same
> > exact load on your engine regardless of how
> hard
> > you push it, so you use caps to store the
> excess
> > electricity generated when it's not at full
> demand
> > and when you go over its ability you will see
> the
> > lights dim to correspond with the audio demand.
> > Tldr: the radio has some load by proxy of being
> > powered by the alternator but that load will
> NOT
> > change in any way short of replacing your
> > alternator with a bigger one.
> > So no bitch carry your ass back to school. I'm
> a
> > card carrying electrician in virginia for over
> 20
> > years in ac and dc low voltage controls
>
> So again, where does the energy that drives the
> speakers come from?
It comes from the alternator, but what you aren't understanding is that the alternator is the limit and doesn't change how it draws from the motor depending on its load. That's why the lights will dim when the bass hits if you max it out. The alternator is oversized for the electrical demands of the car so there is an excess being generated while the car is powering its normal load, so this isn't free energy, you add capacitors to store the excess that's typically wasted energy. If you add too much audio equipment for the alternator to power with capacitors you will have to buy a higher amperage alternator or get it rebuilt with custom windings. Changing the alternator is the only way to affect your mileage with audio equipment (ignoring the mileage loss from added weight which is irrelevant to this specific conversation)