A specified resistive load
A fictional bench calculation gives a 28 volt ideal DC source and a purely resistive 4 ohm load. The question first ignores wiring loss and asks for current and power. A later note says a different source has a stated continuous current capability of 5 amperes. A learner assumes the same 28 volt label proves it can support the load indefinitely, without considering that rating. No real aircraft bus, protective-device curve or approved test connection is supplied. The task is to apply the stated electrical model, then identify the mismatch between demand and the second source’s specified capability. It does not recommend reconnecting a tripped circuit breaker, bypassing protection or making any energized maintenance measurement. A correct answer should retain units and distinguish the ideal arithmetic from an installation-specific operational conclusion.
1. Find the ideal load current and power.
Read the worked answer
Current is V/R=28/4=7 amperes. Power is VI=28×7=196 watts for the stated ideal resistive load.
2. What follows about the 5 ampere continuous-source rating?
Read the worked answer
The calculated 7 ampere demand exceeds the stated 5 ampere continuous capability. Matching voltage labels alone does not establish adequate supply; no real switching or protection action is authorized by the exercise.