The three most basic units in electricity are voltage (V), current (I) and resistance (r). Voltage is measured in volts, current is measured in amps and resistance is measured in ohms. If we compare an electrical system to a water system, it would shake out like this: |
The voltage is equivalent to the water pressure, the resistance is equivalent to the pipe size and the current is equivalent to the rate at which the water is flowing. The relationship between these three can be stated as follows:
I = V/r (Current in Amps is equal to voltage divided by resistance)
So, using our water analogy, let's say you had a power nozzle on your hose. If you open the faucet more, you will increase the pressure in the hose and the water will flow faster. In electrical terms, increasing the pressure is like increasing voltage and the resulting increase in flow is an increase in current.
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