CORRECT OPTION IS (A) .
The advantage of series-connections is that they share the supply voltage, hence cheap low voltage appliances may be used.

Cost Efficiency of Series and Parallel Connections in Electrical Engineering

In electrical engineering, the cost efficiency of connections is an important consideration when designing circuits. There are two main types of connections used in electrical circuits: series and parallel. Let's explore which one is the most cost-efficient.

Series Connection
A series connection is one in which the components are connected end to end. The current flowing through each component in a series circuit is the same, and the voltage across each component is different. The total resistance of a series circuit is equal to the sum of the individual resistances of the components.

Cost Efficiency of Series Connection
Series connections are generally considered less cost-efficient than parallel connections. This is because if one component in a series circuit fails, the entire circuit will be disrupted. Additionally, the voltage drop across each component in a series circuit means that more power is lost in the form of heat, reducing overall efficiency.

Parallel Connection
A parallel connection is one in which the components are connected across each other, with each component connected to the same two points in the circuit. The voltage across each component in a parallel circuit is the same, and the current flowing through each component is different. The total resistance of a parallel circuit is less than the resistance of the individual components.

Cost Efficiency of Parallel Connection
Parallel connections are generally considered more cost-efficient than series connections. This is because if one component in a parallel circuit fails, the other components will continue to function. Additionally, the voltage drop across each component in a parallel circuit is less than in a series circuit, resulting in higher efficiency.

Conclusion
Based on the above information, we can conclude that the most cost-efficient connection in electrical engineering is a parallel connection. However, the choice between a series and parallel connection ultimately depends on the specific requirements of the circuit and the components being used.

That explanation doesn't make it Efficient