Final answer:
Signals with a very low source resistance are less sensitive to electrical noise from welders and electric motor starters.
Step-by-step explanation:
Generally, electrical signals with a very low source resistance are less sensitive to electrical noise from welders and electric motor starters. This is because signals with low source resistance have a better ability to maintain their integrity and resist interference.
One example of low source resistance is when two parallel wires are used. The magnetic fields generated by these wires tend to cancel out in the area between them, reducing the interference. Another example is the counter-wound heating coils in an electric clothes dryer, which cancel each other's magnetic fields and greatly reduce mutual inductance with the dryer case.
Therefore, signals with low source resistance can be more reliable and less affected by electrical noise, making them suitable for applications where interference is a concern.