Final answer:
True, first aid must start within a few minutes after a worker receives an electric shock. This is critical due to the immediate risks of ventricular fibrillation and burns, with a fast response being essential for the victim's survival.
Step-by-step explanation:
When a worker receives an electric shock, it is true that first aid must start within a few minutes. Considering the rapid onset of potential life-threatening conditions like ventricular fibrillation and the risk of burns at higher currents, immediate action is critical for the victim's survival and to mitigate serious health consequences. Electrical shocks can cause involuntary muscular contractions, making it impossible for the victim to release the electrical source. Currents between 100 and 300 mA may lead to ventricular fibrillation, an irregular and ineffective heart rhythm that can be fatal. Above 300 mA, the risk of burns increases significantly. Accordingly, time is of the essence in providing first aid, calling emergency services, and beginning cardiopulmonary resuscitation (CPR) if necessary.