In mathematics we had exponents which were the power to a given any base number, in excel we have a similar inbuilt function known as POWER function which is used to calculate the power of a given number or base, to use this function we can use the keyword =POWER( in a cell and provide two arguments one as number and another as power.
Power in Excel
A Power in Excel is a Math/Trigonometric function computes and returns the result of a number raised to a power. Power Excel function takes two arguments the base (any real number) and the exponent (power, that signifies how many times the given number will be multiplied by itself). This means that, for example, 5 multiplied by a power of 2 is the same as 5 x5.
Formula of POWER Function
Explanation of POWER Function in Excel
Power in Excel takes both the argument as a numeric value; hence the arguments passed are of integer type where Number is the base number, and the Power is the exponent. Both arguments are required and are not optional.
We can use the Power function in excel in many ways, like for mathematical operations, power function equation and can be used to compute the relational algebraic functions.
How to Use POWER Function in Excel
Excel POWER function is very simple and easy to use. Let us understand the working of POWER in excel by some examples.
POWER in Excel Example #1
For example, we have a power function equation y=x^n (x to the power n), where y is dependent on the value of x, and n is the exponent. We also want to draw the graph of this f(x, y) function for given values of x and n=2. The values of x are:
So, in this case, since the value of y depends upon the nth power of x, we will calculate the value of Y using the POWER function in Excel.
- 1st value of y will be 2^2 (=POWER(2,2)
- 2nd value of y will be 4^2 (=POWER(4,2)
- 10th value of y will be 10^2 (=POWER(10,2)
Now, selecting the values of x and y from range B4:K5, select the graph (in this, we have selected the Scatter graph with smooth lines) from the insert tab.
So, we get a linear, exponential graph for the given POWER Function equation.
POWER in Excel Example #2
In algebra, we have the quadratic POWER Function equation, which is represented as ax2+bx+c=0, where x is unknown, and a, b and c are the coefficients. The solution of this POWER Function equation gives the roots of the equation, that is, the values of x.
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The roots of the quadratic POWER Function equation are computed by following mathematical formula
- x = (-b+ (b2-4ac)1/2)/2a
- x = (-b- (b2-4ac)1/2)/2a
b2-4ac is termed as discriminant and it describes the number of roots a quadratic POWER Function equation has.
Now, we have some list of quadratic POWER Function equations given in Column A, and we need to find the roots of the equations.
^ is called the exponential operator used to represent the power (exponent). X2 is the same as x^2.
We have five quadratic POWER Function equation, and we will be solving them using the formula with the help of the POWER function in excel to find out the roots.
In the first POWER Function equation, a=4, b=56 and c = -96, if we mathematically solve them using the above formula, we have the roots -15.5 and 1.5
To implement this in excel formula, we will use the POWER function in Excel and the formula will be
- =((-56+POWER(POWER(56,2)-(4*4*(-93)),1/2)))/(2*4) will give the first root and
- =((-56-POWER(POWER(56,2)-(4*4*(-93)),1/2)))/(2*4) will give the second root of the equation
So, the complete formula will be,
=”Roots of equations are”&” “&((-56+POWER(POWER(56,2)-(4*4*(-93)),1/2)))/(2*4)&” , “&((-56-POWER(POWER(56,2)-(4*4*(-93)),1/2)))/(2*4)
Both the formulas are concatenated together with String “Roots of equation are”.
Using the same formula for other POWER Function equation, we have,
POWER in Excel Example #3
So, for different mathematical calculations, we can use the POWER function in Excel.
Suppose we have to find out the compound interest for which the formula is
Amount = Principal (1 + r/n)nt
- Where r is the rate of interest, n is the number of times interest is compounded per year, and t is the time.
- If an amount of $4000 is deposited into an account (saving) at an interest rate of 5% annually, compounded monthly, the value of the investment after 5 years can be calculated using the above compound interest formula.
- Where Principal = $4000, rate = 5/100 that is 0.05, n =12 (compounded monthly), time =5 years
Using the compound interest formula and implementing it into excel formula using the POWER function in Excel, we have the formula.
So, the investment balance after 5 years is $5.133.43
POWER in Excel Example #4
According to Newton’s gravitation law, two bodies at a distance of r from their center of gravity attracts each other in the universe according to a gravitational POWER Excel formula.
F = (G*M*m)/r2
Where F is the magnitude of the gravitational force, G is called the gravitational constant, M is the mass of the first body, and m is the mass of the second body, and r is the distance between the bodies from their center of the gravity.
Let us calculate the magnitude of gravitational force by which the Sun pulls the Earth.
- Mass of Sun is 1.98*10^30 kg.
- The mass of Earth is 5.97*10^24 kg.
- The distance between the Sun and the Earth is 1.496 x 10^11 meters.
- Gravitational constant value is 6.67*10^-11 m3kg-1s-2
In excel, if we want to calculate the gravitational force, we will be again using the POWER in Excel that can operate over big numeric values.
- So, using the POWER in Excel, we can convert the scientific notation values into the POWER Excel formula
- 1.98*10^30 will be represented as 1.98*Power(10,30), similarly other values.
- So, the POWER Excel formula to calculate the force will be =(6.67*POWER(10,-11)*1.98*POWER(10,30)*5.97*POWER(10,24))/POWER(1.496*POWER(10,11),2)
Since the value obtained as force is a big number of Excel expressed it scientific notation. To change it into a fraction, change the format to the fraction.
So, Sun pulls the Earth with a force of magnitude 35229150283107900000000 Newton.
This has been a guide to POWER Function in Excel. Here we discuss the POWER Formula in excel and how to use the POWER Excel function along with excel example and downloadable excel templates. You may also look at these useful functions in excel –