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VOLTAGE
We define voltage as the amount of potential energy between two points on a circuit. One point has more charge than another. This difference in charge between the two points is called voltage. It is measured in volts​
When describing voltage, current, and resistance, a common analogy is a water tank. In this analogy, charge is represented by the water amount, voltage is represented by the water pressure, and current is represented by the water flow. So for this analogy, remember:
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Water = Charge
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Pressure = Voltage
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Flow = Current
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Now, Consider a water tank at a certain height above the ground. At the bottom of this tank there is a hose.
POWER
In general physics terms, power is defined as the rate at which energy is transferred (or transformed).
To calculate the power of any particular component in a circuit, multiply the voltage drop across it by the current running through it. P=VI
Energy is measured in terms of joules (J). Since power is a measure of energy over a set amount of time, we can measure it in joules per second. The SI unit for joules per second is the watt abbreviated as W.