How many volts are in the power lines?

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Description : How many volts does it take to power an Arduino?

Answer : 5volts is enough to supply the Arduino.

Answer : Overhead lines for power supply to tramcars are at a minimum height of 10 m.

Description : State the effects of low power factor on efficiency and voltage regulation of short transmission lines. 

Answer : i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor) 

Description : Why don't we burry power lines underground ?

Answer : Because conductor used for power transmission are not insulated and if we do so it create phase to ground fault causing interruptions to supply.

Description : In tuned power lines, on load :  (A) the receiving end voltage is numerically equal to the sending end voltage  (B) the receiving end current is numerically equal to the sending end current  (C) there is no voltage drop  (D) all the above

Answer : In tuned power lines, on load :  (A) the receiving end voltage is numerically equal to the sending end voltage  (B) the receiving end current is numerically equal to the sending end current  (C) there is no voltage drop  (D) all the above