Shown here is a simplified representation of an electrical power plant and a house, with the source of electricity shown as a battery, and the only electrical “load” in the house being a single light bulb:
Why would anyone use two wires to conduct electricity from a power plant to a house, as shown, when they could simply use one wire and a pair of ground connections, like this?
This circuit has four “test points” labeled with the letters A, B, C, and D. Assuming the circuit is functioning (light bulb is energized), determine whether or not there will be substantial voltage between the following sets of points:
- • Between A and B: voltage or no voltage?
- • Between B and C: voltage or no voltage?
- • Between C and D: voltage or no voltage?
- • Between D and A: voltage or no voltage?
- • Between A and C: voltage or no voltage?
- • Between D and B: voltage or no voltage?
Based on these voltage determinations, what general statement(s) can you make about the presence or absence of voltage in a functioning circuit?
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