Question

Alternating current is transmitted to distant places at

• A. high voltage and low current
• B. high voltage and high current
• C. low voltage and low current
• D. low voltage and high current

Answer 1

The correct option is A

high voltage and low current

1. Alternating current is defined as the current that changes its magnitude and direction with time.

2. The rate of transfer of electrical energy per unit of time is known as Power.

3. We know, the power is given by,

$P=I^{2}R$

where,

$P=$Power

$I=$current flowing through the wire

$R=$Resistance of the conducting wire.

$\Rightarrow$When the current is low, then the value of $P$will also be less.

4. So, we need to keep the voltage high so that the power in output is not very less than the input power.

Hence, the option $A$ is the correct answer.