Final answer:
Tech A is correct in saying that a series circuit has only one path for current, while Tech B is incorrect about parallel circuits; current does not flow through one resistor before getting to the next, instead each has its own direct path to the voltage source.
Step-by-step explanation:
Tech A correctly states that a series circuit has only one path for current to flow, ensuring the current is the same at every point in the circuit. This is evident as adding a resistor in series increases the total resistance and consequently decreases the circuit current, which is illustrated by the ammeter readings in diagrams comparing circuits with different numbers of series resistors.
In contrast, Tech B's statement regarding parallel circuits is not entirely accurate. When resistors are connected in parallel, they do not have the current flowing through one before reaching the next. Instead, in a parallel circuit, all resistors are connected directly to the voltage source, providing multiple paths for current to flow.
Each resistor in a parallel configuration can have a different current based on its resistance value, but they all share the same potential drop across them. As a result, the equivalent resistance decreases, and the total circuit current can increase, allowing more current to flow through the circuit as compared to when a single resistor is connected.
Therefore, only Tech A is correct. To further clarify, when three identical resistors are connected in parallel, the combination makes three identical paths for current flow, effectively making it three times easier for the current to flow than through a single resistor, which reduces the total resistance of the circuit.