Which practice helps prevent voltage drops and arcing in a robot's electrical system?

• A. Using thinner wires
• B. Ensuring reliable electrical connections
• C. Running wires loosely exposed
• D. Using diodes in series unnecessarily

Answer: (B)

Keeping all power and ground connections solid and low in resistance is what prevents voltage drops and arcing. When connections are clean, properly sized, and securely fastened (correct terminals, crimps, or solder joints, and cleaned contact surfaces), the contact resistance remains very small. That means the voltage seen by components stays near the supply even under load, and current transitions don’t create the high-pressure gaps that lead to arcing.

Loose, corroded, or undersized connections raise resistance, causing more voltage to drop across those joints as current flows. That under-load sag can cause devices to behave unpredictably, heat builds at the contacts, and the unstable contact can spark (arc) as it attempts to conduct. Wiring that’s left loose or exposed is more susceptible to vibration and movement, which can loosen connections or create shorts, further increasing arcing risk.

Using additional diodes in series just adds extra voltage drop and heat without addressing the actual problem of poor or brittle connections, so it’s not an effective way to prevent arcing.

In short, ensure every connection is clean, properly rated, securely fastened, and routed to minimize movement. That reliable network keeps voltage stable and arcing rare.