Efficiency

Efficiency is a ______ of what you put in versus what you get out of a system.

• source
• ratio
• multiplication
• addition

What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the 1machine?

• 0.25 J
• 26%
• 386%
• 3.86 J

Tags

NGSS.HS-PS3-1

What is the efficiency of the machine if the input is 263 J and the output is 142 J? 

• 6.26%
• 54%
• 100%
• 260%

Tags

NGSS.HS-PS3-1

A machine has a work output of 8 joules and requires 10 joules of work input to operate. What is the machine's efficiency?

• 8 J
• 10 J
• 80%
• 800%

What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 92.3%? 

• 2,690J
• 92.3J
• 0.0082J
• 2,584.4

Tags

NGSS.HS-PS3-1

What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules?

• 87.50%
• 1200
• 1.142
• 114%

Work output of a large machine in a factory is 89,000 Joules, and its input is 102,000 joules. Work output of a similar machine is 92,000 joules, and its work input is 104,000 joules. Which machine has greater efficiency?

• The first machine
• The second machine
• Not enough information provided

Lucas has been challenged to increase the efficiency of a device he is redesigning. His goal is 90% efficiency. The work input of the device is fixed at 10 joules, so Lucas is trying to improve work output. How many joules of work output should Lucas aim for to attain his goal of 90% efficiency?

• 9 Joules
• 900 Joules
• 0.9 Joules
• 25 

Tags

NGSS.MS-PS3-5

What is the efficiency of a machine when the input is 263 J and the output is 142 J.

• 1.85 %
• 18.5 %
• 5.39 %
• 53.9 %

Tags

NGSS.HS-PS3-1

Ratio to work out to work in

• Efficiency
• Law of Conservation of Energy
• Transformation
• Lumens

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4