VoSKILL Academy
Electrical Helper Low Voltage

Volts, Ohms and Amps

Ohm’s Law explained with water: pressure, pipe size, and flow

Tank height = pressure 120 V Volts push the flow Pipe squeeze = resistance 10 Ω Ohms fight the flow Flow = current 12 A Amps do the work Same thing as a circuit: 120 V source 10 Ω load A 12 A
120V
Volts: push (pressure)
10Ω
Ohms: resistance (pipe squeeze)
12A
Amps: current (flow)
1440W
Watts: power (V × A)
Holding
20 A breaker
12 A=120 V÷10 Ω
Amps = Volts ÷ Ohms. Cover the one you want and the other two tell you the math.

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