# Help Zone

### Student Question

Secondary IV • 1yr.

Hi, I can’t seem to understand how I can find time with the EE formula. How is this possible and what are the steps? (By the way, it’s not an exam don’t worry I’m not cheating)

T

hank you!

Physics

## Explanations (1)

• Explanation from Alloprof

Explanation from Alloprof

This Explanation was submitted by a member of the Alloprof team.

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Team Alloprof • 1yr. edited September 2022

Hi UnusualCrocodile,

Before using the EE formula, you must find the time it takes to reach 1.0 MJ with a power of 1700W.

Remember that 1 W equals to 1 J per second. Thus, 1700 W equals to 1700 J/s.

1.0 MJ equals 1,000,000 J. If you divide this number by 1700 J/s, you will find the time it takes to produce 1.0 MJ.

Therefore, you need to find the real consumption of energy of the fryer with an energy efficiency of 90% (by using the EE formula). Then, you will be able to find the answer using the method I described.

Don't hesitate to reach out if you have any question!

Kylan