One kilowatt-hour is equal to which of these values?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

What is the major limitation to the light microscope?