How can you tell that this iron operates using the mains supply?

[chessie273]

Hi, I'm new to the forum so i don't really quite know what I'm doing yet!

anyway, i know this question is REALLY basic but physics is not my forte and I'm confused...

"John has just bought a new iron and sees this plate on the handle -
230V
1840W
50Hz"

John irons a shirt for 10s

energy transformed = power x time

so if I'm correct:
time = 10s
power= 1840W
energy transformed = 18400J

the final question "John can tell from the plate that the iron can operate using mains supply. How can he tell this?"

and i have absolutely no idea!

help would be greatly appreciated - i really need to understand this, its from a gcse mock paper and my exam is in a couple of weeks!

 

[chroot]

I don't actually see any question. Where did the 10 seconds come from?

You should post the question exactly as it was given to you.

- Warren

 

[nlightner]

Based on the information provided, it can be determined that the iron operates using the mains supply because of the following reasons:

1. The voltage listed on the handle of the iron is 230V. This is the standard voltage for mains supply in most countries.

2. The power listed on the handle is 1840W. This is a high amount of power, which is necessary for heating the iron to the desired temperature. Mains supply is capable of providing this amount of power.

3. The frequency listed on the handle is 50Hz. This is also a standard frequency for mains supply in most countries.

4. When John irons a shirt for 10 seconds, the energy transformed is 18400J. This amount of energy is consistent with the amount of energy that would be used by an iron operating on mains supply.

Overall, the combination of the high voltage, power, and frequency, along with the energy used during ironing, indicates that the iron operates using the mains supply. Additionally, the fact that the iron has a plug that can be inserted into an outlet further supports this conclusion.