ELECTROPHYSICS
Perhaps the easiest way to understand electrical concepts is by analogy. The properties of electrical current are similar to the flow of water in a stream. If one envisions the stream falling onto a waterwheel, it is easy to understand that the stream's ability to rotate the wheel (power) is a function of the amount of water falling on the wheel (current) and the height from which it falls (pressure or voltage) . Similarly, the electrical power produced by a generator is the product of the electrical current (amperage) and the electrical pressure (voltage). Therefore, power (watts) = current (amps) × pressure (volts).
If water flows through a hose, the diameter of the hose limits the flow of the water, and is analogous to electrical resistance. If flow is held constant, increases in resistance can only be overcome by increasing pressure proportionately. This is governed by the only other equation that we will use: current (amps) = pressure (voltage)/resistance (ohms). The distance that the water will squirt from the end of the hose is a function of the pressure pushing the flow of the water. If the pressure is increased, the stream of water squirts farther, and with more force. Similarly, when electrical pressure is increased, the current becomes more difficult to control, and arcing from the electrode may be produced (analogous to water squirting forcefully from the end of the hose).
Jinhua Huacheng Medical Appliance Co.,Ltd.
Manufactuer of disposable medical products: Electrosurgical pencil,grounding plate,skin stapler and ECG electrode
