Topic 3 - Conservation Of Energy - Efficiency

Question 1

What is the definition of efficiency?

Answer 1

Ratio of useful output over total input of energy

Efficiency is calculated as useful energy transferred by the device divided by total energy supplied to the device.

Question 2

How is efficiency calculated?

Answer 2

Efficiency = useful energy transferred by the device / total energy supplied to the device

This formula helps determine how effectively a device converts input energy into useful output.

Question 3

What are two methods to increase efficiency?

Answer 3

• Reducing waste output
• Recycling waste output

Reducing waste can be achieved through lubrication or thermal insulation, while recycling involves using waste as input.

Question 4

Fill in the blank: Efficiency can be increased by _______.

Answer 4

[reducing waste output and recycling waste output]

Question 5

True or False: Efficiency can only be increased by reducing waste output.

Answer 5

False

Efficiency can also be increased by recycling waste output.

Question 6

What does reducing waste output involve?

Answer 6

It involves methods such as lubrication and thermal insulation

These methods help minimize energy loss in various devices.

Question 7

What does recycling waste output mean?

Answer 7

Using waste output as input, such as absorbing dissipated heat energy

This approach captures energy that would otherwise be lost and reuses it.

Question 8

What factors determine suitable methods for increasing efficiency?

Answer 8

Each situation’s specific requirements

The methods to increase efficiency can vary based on the device and context.