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Electricity involves the controlled flow of charge (current), driven by electrical potential difference (voltage), encountering opposition (resistance). Ohm's Law (V = I * R) mathematically describes their interrelation. Direct Current (DC), typical in batteries, flows unidirectionally, while Alternating Current (AC), supplied by power outlets, periodically reverses. Basic circuits comprise a power source, load (energy consumer), conductor, and switch, arranged in series (single current path) or parallel (multiple paths). Power quantifies the rate of electrical energy consumption. Prioritize safety: always de-energize circuits before working and utilize proper insulated tools. Grounding provides a safe current path during faults, while circuit breakers and fuses prevent excessive current, safeguarding circuits and equipment.