Enter the amplifier output power and the amplifier input power into the calculator to determine the Amplifier Efficiency. 

Amplifier Efficiency Formula

The following formula is used to calculate the Amplifier Efficiency. 

Eamp = O / I *100
  • Where Eamp is the Amplifier Efficiency (%)
  • O is the amplifier output power 
  • I is the amplifier input power 

To calculate the amplifier efficiency, divide the amplifier output power by the input power, then multiply by 100.

How to Calculate Amplifier Efficiency?

The following two example problems outline how to calculate the Amplifier Efficiency.

Example Problem #1:

  1. First, determine the amplifier output power. In this example, the amplifier output power is given as 15.
  2. Next, determine the amplifier input power. For this problem, the amplifier input power is given as 283.
  3. Finally, calculate the Amplifier Efficiency using the equation above: 

Eamp = O / I *100

Inserting the values from above and solving the equation: 

Eamp = 15 / 283 *100 = 5.3 (%)

FAQ

What factors can affect amplifier efficiency?

Several factors can impact the efficiency of an amplifier, including the design of the amplifier circuit, the quality of components used, the operating frequency, and how well the amplifier is matched to its load. Environmental factors like temperature can also play a role.

How can improving amplifier efficiency benefit a system?

Improving amplifier efficiency can lead to reduced power consumption, which is crucial for battery-operated devices. It can also help in minimizing heat generation, thereby reducing the need for cooling systems and potentially extending the lifespan of the amplifier and associated components.

Are there different types of amplifiers based on efficiency?

Yes, amplifiers can be categorized based on their efficiency class. Common classes include Class A, Class B, Class AB, and Class D, each with its own efficiency and application characteristics. For example, Class A amplifiers are less efficient but provide high-quality audio, while Class D amplifiers are highly efficient and are often used in portable and digital devices.