Discussion
Which order applies to disconnecting a battery for service?
Answer: D
Removing the earth first means a spanner touching the body while loosening the positive cannot short the battery. Reconnection is the reverse. It is one of the oldest and most useful workshop conventions. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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