Electric power is transmitted over long dista | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The power loss $(P_L)$ in transmission lines is given by the formula $P_L = I^2 R$,where $I$ is the current and $R$ is the resistance of the wire.

Vedclass · Accepted Answer

Power loss is less

Vedclass · Answer

(C) The power loss $(P_L)$ in transmission lines is given by the formula $P_L = I^2 R$,where $I$ is the current and $R$ is the resistance of the wire.Since the power transmitted is $P = VI$,we can write $I = P/V$.Substituting this into the power loss formula,we get $P_L = (P/V)^2 R = \frac{P^2 R}{V^2}$.From this expression,it is clear that $P_L \propto \frac{1}{V^2}$.Therefore,by increasing the transmission voltage $(V)$,the power loss $(P_L)$ is significantly reduced.

Electric power is transmitted over long distances through conducting wires at high voltage because

Similar Questions

An amount of charge $Q$ passes through a coil of resistance $R$. If the current in the coil decreases to zero at a uniform rate during time $T$,then the amount of heat generated in the coil will be,

How many electrons per second flow through a filament of a $120 \ V$,$60 \ W$ electric bulb?

$A$ ($100\, W$,$200\, V$) bulb is connected to a $160\, V$ power supply. The power consumption would be ............. $W$.

Heat is produced at a rate given by $H$ in a resistor when it is connected across a supply of voltage $V$. If now the resistance of the resistor is doubled and the supply voltage is made $V / 3$,then the rate of production of heat in the resistor will be

An electric lamp is marked $60\, W$, $230\, V$. The cost of $1\, kWh$ of energy is Rs. $1.25$. The cost of using this lamp for $8$ hours a day for $30$ days is Rs. ...............

Vedclass Test Series

Exam Paper Generator

Online Exam Module