The primary advantage of using alternating current is that... a. AC power transm

Question

The primary advantage of using alternating current is that... a. AC power transmission loses far less energy along the wire than DC power transmission. b. AC power stations can be closer together. c. Most store-bought batteries use AC current. d. Voltage transformers are not required. c. if the name of the band AC/DC were instead DC/AC, it would sound really stupid. A bar magnet is dropped through a coil of wire. A student measures the induced EMF as a function of time. Which of the following charts best represents the induced EMF (V) as the magnet falls freely through the coil? A single circular loop of conducting metal standing on edge near the North end of a large magnet falls over (see figure at right). Which of the following is true? a. The loop will try to SPIN CLOCKWISE like a wheel. b. A current will be induced in the loop in the CLOCKWISE direction. c. The torque created by the induced current and changing magnetic flux will cause the metal loop to fall FASTER. d. The torque created by the induced current and changing magnetic flux will cause the metal loop to fall SLOWER. e. Without an initial current through the loop, the magnetic field will have NO EFFECT on the falling loop; it will fall over the same way it would if the magnet were not there.

Explanation / Answer

(14) Ac transmission is done at very high voltages. this reduces the current and hence the power losss i2 Rt.

the voltage is increased with the help of transformers. these transformers donot work with Dc. so the main advantage of using alternating current is that the power losses in the trnasmission are decreased.so option (a) is correct.

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