# What is electrical resonance ?

Discussion in 'Electrical Engineering' started by ABF, Apr 8, 2005.

1. ### ABFGuest

> Resonances need not be just physical movement, its normal to have
> electrical and even thermal resonances under the appropriate conditions.
>

a) What exactly is electrical resonance and how is it caused and what is
it's result/effect?
b) What exactly is thermal resonance and how is it caused and what is it's
result/effect?

Thanks
Anton

ABF, Apr 8, 2005

2. ### Gerald NewtonGuest

"Repeating Rifle" <> wrote in message
news:BE7C5093.37544%...
> in article , at
> wrote on 4/8/05 8:47 AM:
>
>> | b) What exactly is thermal resonance and how is it caused and what is
>> it's
>> | result/effect?
>>
>> I would presume it to be a thermal change propogating and returning, then
>> repeating that process.

>
> There is no such thing. To make a long story short, there is nothing
> equivalent to thermal inductance.
>
> Bill

If we had a heat powered refrigerator operating with its evaporator
discharging heat into the refrigerator and into the unit that vaporizes the
refrigerant operating in balance, wouldn't this be thermal resonance?

Gerald Newton, Apr 9, 2005

3. ### TimPerryGuest

"ABF" <> wrote in message
news:d35nie\$lid\$...
>
> > Resonances need not be just physical movement, its normal to have
> > electrical and even thermal resonances under the appropriate conditions.
> >

>
> a) What exactly is electrical resonance and how is it caused and what is
> it's result/effect?

A state in which the capacitance and the inductance values in a circuit are
equal (net reactance is equal to zero) and the only quantity left is
resistance.

research series resonant and parallel resonant (tank) circuits.

the result/effect is a tuned circuit.

> b) What exactly is thermal resonance and how is it caused and what is it's
> result/effect?
>

beats me try alt.engineering.mechanical

> Thanks
> Anton
>
>

TimPerry, Apr 10, 2005
4. ### Gerald NewtonGuest

"ABF" <> wrote in message
news:d35nie\$lid\$...
>
>> Resonances need not be just physical movement, its normal to have
>> electrical and even thermal resonances under the appropriate conditions.
>>

>
> a) What exactly is electrical resonance and how is it caused and what is
> it's result/effect?
> b) What exactly is thermal resonance and how is it caused and what is it's
> result/effect?
>
> Thanks
> Anton
>

The way I learned this was:
When XC = XL in a parallel LC circuit we have resonance and current travels
back and forth between a capacitor and an inductor. This circuit has
minimum impedance to a wave traveling at a resonance frequency found by:
XC = 1 / 2 x pi x freq in hz x C in farads
XL = 2 x pi x freq in hz x L in henries
Set XL equal to XC and solve for the resonance frequency.

f = 1 / (2 x pi x SQRT(LxC)

It is all explained in detail at: