Final answer:
Only Tech A is correct, as unintended resistance can result in a voltage drop. Tech B is incorrect because the weight of the conductor does not determine electrical resistance, which depends on the material's resistivity, length, and cross-sectional area.
Step-by-step explanation:
Both Tech A and Tech B are discussing aspects of electrical circuits, but only Tech A is correct. Tech A states an important concept in circuits: when there is an unintended resistance, such as in a wire or connection that is not meant to have significant resistance, it can result in a voltage drop.
This can be observed when the electrical current encounters resistance, which causes a loss of electrical power as the current passes through. By Ohm's Law, the voltage drop across a resistor is equal to the product of the current through the resistor and the resistance (V=IR).
On the other hand, Tech B is incorrect. The weight of the conductor is not a direct factor in determining its resistance. Instead, resistance depends primarily on the material's resistivity, the conductor's length and cross-sectional area.
The resistivity is a property inherent to the material itself and is unaffected by the weight of the conductor.