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In a two-supply system, for example, the supply with the higher output voltage will conduct first. "Utility system" means electrical equipment owned by or under the control of a serving utility that is used for the transmission or distribution of electricity from the source of supply to the point of contact and is defined in section 90. Electrical Circuit Diagnosis - Course 623 5-1 The charging system has two essential functions: •Generate electrical power to run the vehicle's electrical systems •Generate current to recharge the vehicle's battery Electrical power - At low engine speeds, the battery may supply some of the power the vehicle needs. In a home, grounding provides a safe pathway for electricity that could cause a shock hazard to residents. 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