Now let us compare these ideas in hydraulics with electrical terms. The driving force in electrical circuits is electrical pressure, usually called potential difference or voltage . A battery is a source of electrical pressure. They are shown below. We see then that hydraulic pressure is similar to electrical pressure or voltage of a source such as a battery.
Electrical current is analogous to water flow rate.
Electrical current is the rate of flow of electrical charges, in the same way as water flow rate is the rate of flow of water molecules. In both cases the flow rate is directly related to the driving force or pressure. In electrical circuits, the current is directly proportional to the electric pressure or voltage applied. In electrical systems, there are two types of charges, positive and negative. In electrical circuits, resistors oppose the flow of charges around a circuit.