I'm an engineer albeit not an E.E., and I have a few questions that some of
you might be able to answer:

- What is the typical efficiency of the power distribution system as it
applies to typical residential customers with 120/240 VAC? (I ask this
because it seems to me that it must be substantially below 100%, when one
considers that there are 5 or more transformers between the power's company
generation station, and end users; plus impedance losses, etc.) Or,
rephrased, for every 100 kilowatt-hours used at a home, how many
kilowatt-hours would be required at the generating plant's high-voltage
connection to the distribution system?

- What is the approximate efficiency of the best DC motors available these days (power available to motor divided by mechanical equivalent of electrical energy used?) Also, what is a more typical efficiency for DC motors?

- Can DC motors be run more efficiently if there are designed to run at higher voltages (compared to lower voltage DC motors?)

Thanks in advance,

M.H.

- What is the typical efficiency of the power distribution system as it

- What is the approximate efficiency of the best DC motors available these days (power available to motor divided by mechanical equivalent of electrical energy used?) Also, what is a more typical efficiency for DC motors?

- Can DC motors be run more efficiently if there are designed to run at higher voltages (compared to lower voltage DC motors?)

Thanks in advance,

M.H.