Enter the voltage across the string (volts), the number of discs, and the voltage across the disc nearest to the conductor (volts) into the calculator to determine the String Efficiency.

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## String Efficiency Formula

The following formula is used to calculate the String Efficiency.

**SE = Vs / (#D*VD)**

- Where SE is the String Efficiency
- Vs is the voltage across the string (volts)
- #D is the number of discs
- VD is the voltage across the disc nearest to the conductor (volts)

## How to Calculate String Efficiency?

The following example problems outline how to calculate String Efficiency.

**Example Problem #1**

- First, determine the voltage across the string (volts). In this example, the voltage across the string (volts) is determined to be 59 .
- Next, determine the number of discs. For this problem, the number of discs is measured to be 59 .
- Next, determine the voltage across the disc nearest to the conductor (volts). In this case, the voltage across the disc nearest to the conductor (volts) is found to be 4.
- Finally, calculate the String Efficiency using the formula above:

SE = Vs / (#D*VD)

Inserting the values from above and solving the equation yields:

SE = 59 / (59*4) = .25

**Example Problem #2**

Using the same method as above, determine the variables required by the equation. For this example problem, these are:

voltage across the string (volts) = 934

number of discs = 49

voltage across the disc nearest to the conductor (volts) = 30

Enter these given values into the calculator or above yields:

SE = 934 / (49*30) =** **.63