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From Appropedia
DC circuit analogy: 1 Tank 2 Parallel Blenders

Electricity basics. Some basic definitions, equations and analogies of electricity.

Term Symbol   Unit Description Water Analogy
Voltage V volt (V) Pressure (Potential) difference due to charge difference Head: Pressure (Potential) difference due to height difference
Current I amp (A) Flow of charge in charge/time or coulombs/sec Flow: Flow of water in volume per time such as liters/sec
Resistance R ohm (Ω) Opposition to the flow of charge Friction: Opposition to the flow of water
Power P watt (W) Energy/Time = Power=Current*Voltage Power: Power=Current*Pressure
Energy E watt-hour (Wh) The ability to do work Energy: The ability to do work