Question

the laws of electricity are being discussed. technician a states that as a conductor heats up, its resistance increases. technician b states that resistors are designed to extract energy from the current flow as it passes through the resistor. who is correct? select one: a. technician a only b. technician b only c. both technicians a and b d. neither technician a nor b

Explanation:

• For Technician A: In most conductors (like metals), resistance \( R \) is related to temperature by \( R = R_0(1 + \alpha\Delta T) \), where \( R_0 \) is initial resistance, \( \alpha \) is temperature coefficient (positive for conductors), and \( \Delta T \) is temperature change. So as a conductor heats up ( \( \Delta T>0 \) ), resistance increases.
• For Technician B: Resistors convert electrical energy to heat (Joule heating: \( P = I^2R \)), so they extract energy from current flow (as heat) when current passes through.

Thus, both statements are correct.

Answer:

c. Both Technicians A and B