What is the speed with which electric power is transmitted through the power grid Believe it or not, the education center at an important nuclear power plant claims that "electrons travel at the speed of light," an obvious impossibility for current i?

Answer Amazingly enough, the speed at which electric power travels through a wire is very different from the speed at which electrons move through that wire. In most wires, electric power travels at very ... Read More »

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Why are physicists so skeptical about peoples' claims to have invented motors that provide mechanical power without consuming electric power or generators that produce electric power without consuming mechanical power from the systems that turns them?

While it may seem as though there is some grand conspiracy among physicists to deny validation to those inventors, nothing could be farther from the truth. Physicists generally maintain a healthy s... Read More »

I think that the speed of light could be broken by turning a very long lever. If the lever is long enough and you have enough power to turn it, the end of the lever will travel faster than the speed of light. Is this so — NL, Hong Kong?

I'm afraid that this technique won't work—the torque you would have to exert on the lever to make its end approach the speed of light would become infinite and the energy you would have to transf... Read More »

In your response to Question 891, you wrote of the advantages of alternating current power transmission. Hasn't lately there been some discussion of going to DC power transmission I believe it is supposed to have superior operating properties when ?

You're right that DC (direct current) power transmission has some important advantages of AC (alternating current) power transmission. In alternating current power transmission, the current reverse... Read More »

How does a stereo convert 110 volt electric current into the positive and negative current that is sent to power the speakers — JF?

A stereo contains a power supply that converts 110-volt alternating current into lower-voltage direct current. This direct current is ultimately when powers the speakers. The stereo's power supply ... Read More »