- Determine the energy supplied to the machine or work done on the machine.
- Find out the energy supplied by the machine or work done by the machine.
- Divide the value from Step 2 by the value from Step 1 and multiply the result by 100.
- Congratulations!
The biggest expense for many businesses, including the majority of small businesses, is labor. For the majority of retail and small manufacturing businesses, salaries and wages are the largest line-item expense, but labor also frequently responds to productivity gains. Entrepreneurs should think about tracking employee productivity and establishing challenging performance goals to cut labor costs and maximize labor productivity.
Simply put, productivity is the number of units of a good or service that a worker handles in a certain amount of time. A worker making widgets might produce 20 per hour, or a worker serving customers in a coffee shop might serve 15 per hour. Simple productivity is neither good nor bad, and in service industries, it may vary depending on factors outside of the control of the employee, such as the number of customers present for service. Productivity is the basic measure of employee work output.
Productivity and efficiency require a defined unit of service (UOS). UOS analysis is typically task-specific and most pertinent to employees with repetitive jobs. For instance, the UOS for a spot welder might be “welds completed” or “parts completed,” whereas the UOS for a hotel housekeeper might be “rooms cleaned per shift.” Some jobs defy accurate UOS measurements, especially professional jobs with variable output.
Efficiency is a comparison between an employee’s actual time spent performing each UOS and the estimated time needed to finish it. For instance, a worker who packages DVDs might assemble 80 DVDs in an hour. The employee is 80% effective and has the capacity to produce 20 more units per hour if the best-practice target is 100 DVDs in an hour as measured by a time study.
The portion of an employee’s paid time that is actually spent doing direct work should typically be reported separately. For example, an employee who is paid for working 8. Despite working 0 hours, due to meetings and lunch breaks, you only work 6 According to UOS analysis, 0 hours only spends 75% of her time being “productive.” Only the six hours worked should be taken into account when calculating efficiency scores.
Some industries have basic benchmarks already established. As an illustration, telephone call centers have service levels that specify the ideal duration for typical transactions and are uniform across industries. However, the majority of businesses will need to decide for themselves how long fundamental tasks should take and then set performance goals in line with that. A time study should be used to perform the baseline measurement, averaging the time needed for multiple transactions or determining how long it would take an average employee to complete the task.
Longitudinal reporting is where measuring employee productivity really pays off. An individual employee’s long-term productivity can affect merit increases and bonuses, and measuring efficiency over time can help identify opportunities to reorganize staffing or add or remove employees based on the company’s volume of business. Efficiency scoring can also help with predictive modeling. If it takes 90 seconds to make a widget and workers are working at 75 percent efficiency, then only 30 widgets will be produced in an hour rather than 40.
Efficiency Calculation
Why is calculating work efficiency important?
Professionals in engineering and physics should calculate work efficiency because it can help them comprehend how energy moves through a machine and how much energy each machine loses. It is crucial because it can assist these professionals in conserving scarce resources like scarce human resources due to operating restrictions in a region or scarce fossil fuels like oil. Last but not least, using machines that require less input to produce the same output or that produce more with the same input can help businesses that use heavy machinery reduce their operating costs.
What is work efficiency?
Work efficiency is a way to gauge any machine’s output in relation to its input. Simple machines like levers, pulleys, wedges, screws, and inclined planes as well as more complex ones like bicycles, automobile engines, and wind turbines can all be used in this way. The following formula can be used to determine work efficiency as a ratio and express it as a percentage of an input to a machine and what it produces:
Efficiency = (Energy Output / Energy Input) x 100
Where:
The more closely the product of the equation approaches 100% when calculating work efficiency, the more effective the machine The best machines to use at work are frequently those that are more efficient because they can reduce your use of resources like money, energy, and the amount of labor you must perform to achieve a given level of profit.
How to calculate work efficiency
You can use the steps listed below to determine your work efficiency:
1. Collect information about input and output energy
Gather the energy input, the energy unit in the International System of Units, and the energy output of the machine in Joules before performing the calculation to determine the work efficiency of a machine. Make sure to calculate each energy input that a machine may have and to include it in the total amount of energy that is input. All machines experience energy loss as other forms of energy. For instance, when a hammer strikes a nail, some energy is lost as heat and some as sound.
Because all machines are subject to the law of conservation of energy, which states that energy can only change from one form to another and cannot be created or destroyed, the output of a machine almost always falls below the input, making almost all percentages less than 100%. The most efficient machines have an efficiency of 80% or higher, but that doesn’t mean they’re always the best tools for the job. For instance, while using a hammer to strike a nail might have a lower percentage initially, doing so over time will save the user of the hammer energy.
2. Fill information in for each part of the equation and simplify
Once you’ve gathered your data on the machine’s input and output energies, you can use that data to complete the missing pieces of the equation. For instance, if a lever, for instance, moves a 10-pound box 1 foot in the air while requiring 6 pounds of force from a person to move their end down 2 feet, your equation would be:
Efficiency is calculated as (10 pounds per foot of work) / (20 pounds per foot of work) (6 pounds per foot of work) x 100.
Which you can simplify as:
Efficiency is calculated as (10 foot pounds of work / 12 foot pounds of work) x 100.
3. Calculate energy output divided by energy input
You can carry out the first step of your calculation by dividing your output energy by your input energy after you have simplified your equation. Using the example from the previous step, your equation is:
Efficiency is calculated as (10 foot pounds of work / 12 foot pounds of work) x 100.
Divide 10 foot-pounds of work by 12 foot-pounds of work:
10 / 12 = 0.83
4. Multiply by 100 for your final percentage
After dividing the total result by the total input, multiply the results by 100 to obtain the machine’s efficiency as a percentage. Using the aforementioned example, you can use the division result of 0. To determine your final machine efficiency, take 83 and multiply it by 100. For example:
Efficiency = 0.83 x 100
Multiply the final two numbers in your equation:
0.83 x 100 = 83%
This indicates that the efficiency of the lever you used to move the box was 83%, which is relatively high for simple machines like levers and wedges.
5. Repeat steps 2 through 4 for each machine
Sometimes you want to assess the effectiveness of various devices to determine which one best suits your unique requirements. In these circumstances, you can repeat steps two through four of this procedure to determine each machine’s efficiency. For instance, you could use a pulley to lift the 10-pound box instead of a lever. If the pulley has an input of 5. If a person standing over two feet lifts the same box one foot using 5 pounds of force, the pulley’s efficiency is equal to:
Efficiency = (10 foot-pounds of work / (5. 5 pounds of force x 2 feet)) x 100.
Efficiency is calculated as (10 foot pounds of work / 11 foot pounds of work) x 100.
Efficiency = 0.91 x 100
Efficiency = 91%
6. Compare the eventual results for each machine
Once you have determined each machine’s overall efficiency, you can compare them to determine which is more efficient. By comparing the efficiency of the pulley and the lever in the aforementioned examples, you can see that the former is more effective (91% vs. 83%, respectively). This indicates that the pulley is simpler for the user to operate and may facilitate easier work over a longer period of time. This could also imply that finding novel approaches to complete the same task could boost the general productivity of your production team members.
Example of calculating work efficiency
An illustration of calculating work efficiency while lifting a 20-pound crate using three straightforward levers of various lengths is given below:
The first step is to compile data on each lever’s input and output, as in the following example:
Next, for efficiency and simplification, add the data from the first lever to the equation:
Efficiency1 is equal to (20 pounds of force per foot) / (6 pounds per foot) multiplied by 100.
Efficiency1 is equal to 20 foot pounds divided by 24 foot pounds multiplied by 100.
Then, calculate output divided by input and multiply by 100:
Efficiency1 = 0.83 x 100
Efficiency1 = 83%
Next, repeat the steps for the other levers:
Lever three:
Finally, you can compare the efficiencies of each lever. Lever one is 83% efficient, lever two is 100% efficient, and lever three is 42% efficient. The second lever is most effective for lifting a 20-pound crate in the air because it does the job without wasting any energy.
FAQ
How do you calculate work efficiency and joules?
Efficiency is the proportion of input work (user work) that is converted into output work (machine work). Because some of the input work is used to remove friction, the output work is always less than the input work. Therefore, efficiency is always less than 100 percent.
What is efficiency work done?
Efficiency is the proportion of input work (user work) that is converted into output work (machine work). Because some of the input work is used to remove friction, the output work is always less than the input work. Therefore, efficiency is always less than 100 percent.
