PhysicsProf Steven E. Jones circuit shows 8x overunity ?

[LarryC]

What I am suggesting is this; if the scope and DMM methods do not agree, one of them must be wrong. DC power sources have a power factor of 1.0, therefore heavily averaging the current and voltage measurements is not only the best way to measure the INPUT power, but it is the easiest and most accessible.

DC power factor is 1.0. True in most cases, but not in this circuit. Check out the attached picture, from the first video showing the input volts, current and V x I, and note the current trace, showing positive and negative current.  DMM method of true rms V x I does not take into account phase differences. Steven's Tek measurements methods does account for the phase difference and seems correct.

In fact, it appears that some energy is being returned to the battery.

Regards, Larry     

[WilbyInebriated]

hey poynty, did you ever verify that "Measuring INPUT Power Accurately and with no Oscilloscope" with anything other than a sim? i see you pimping it all over, yet your thread about it is still locked and you have been promising updates... yet there are none.  i asked you about after a month of silence and now another month has gone by. what gives?

[xee2]

In fact, it appears that some energy is being returned to the battery. 

Yes. When the output coil magnetic field collapses a pulse of energy is pushed back into the battery. This was documented in the Joule ringer thread.

[xee2]

DMM method of true rms V x I does not take into account phase differences. Steven's Tek measurements methods does account for the phase difference and seems correct. 

If the power is being computed from the instantaneous current and voltage the power factor does not apply. That is only needed when computing using the peak or RMS values.

[poynt99]

Larry, I was writing a nice long post, then I was interrupted and my pc shut down, so I lost it.

Suffice it to say that since we are dealing with a DC source, all that need be done is to multiply the battery voltage (which is 99% DC when measured directly across the battery terminals, unless the battery is in poor or discharged condition), times the heavily averaged CSR voltage. Then factor in the value of the CSR (x4 if using a 0.25 Ohm for eg.) and the result is the average power from the battery.

The PF=1 for a DC source holds in all cases.

.99