I would assume you are speaking of AC circuits, and do not wish a long winded engineering primer.
The basic formulas to calculate all:
A=Amperes
V=Volts
W=Watts
AxV=W , W/V=A, W/A=V
So, to find Amps, divide voltage into the wattage A = W/V
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Use the formula: power = current x voltage. In SI units: watts = amperes x volts.
The number of watts measures the power, and Ohm's laws requires us to know the current as well as the voltage to determine the power.P = i x eFor example, if the fridge draws 10 amps at 115 volts, the power is 1150 watts.AnswerThe answer is that it depends on the fridge. Look at the nameplate information for your particular fridge; that's where you will find your answer.
Given only the midpoint you cannot.
It depends on what equations are given.
In general you cannot find the perimeter of any shape if only the area is given.
Multiply the given fraction by 1.