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Could you please take a look at this:
the 1st sentence is complicated.

1 When I use the multi way plug for my computer, I don't pick up all the wifi connections there are. That's because there isn't enough electricty flowing into your computer, and you're computer is running at 50 percent of it's capacity/of its energy. (the screen isn't as lit etc...) How would you say this?)

2 By looking at her hands you can tell she's overweight./From looking.../from the look of her hands, you can tell...

3 Its normal that he wants to see if the computer works before buying it. He's a cautions person/for him to want to see if...

4 He kept the money just in case he gets hungry/got hungry (whats the difference?)

thank you
Comments  
1 When I use the multi way plug for my computer, I don't pick up all the wifi connections there are. That's because there isn't enough electricty flowing into your computer, and you're computer is running at 50 percent of it's capacity/of its energy. (the screen isn't as lit etc...) How would you say this?)

1) Your computer's WIFI reception and where it gets it's power from don't interact with each other.

That mutilple-way plug (as you called it) is called by several descriptions: power strip/ mutiple-outlet extension, and for computer connection, most people would spend a little more on a surge-protected model.

2) punctuation!

3) Natural way:

It's reasonable that he wants to see the computer in full operation before making the purchase.

4) Without more concrete context, it's hard to offer any comment.

I would say "he has kept the money just in case he gets money. (present perfect)
Thank you,

and which would you say?

1 ....is running at 50 percent of it's capacity/of its energy

How would you say it?

Thanks
Students: Are you brave enough to let our tutors analyse your pronunciation?
The reason I didn't comment on this is because that is not how it works. If your wall outlet (in the US is 115 Volts AC) for some reason only has 60 volts which is a hair over 50% of the normal power, your computer will not be able to power up. However, ifit is powered up and initialized, the speed is dictated by the CPU (Pentium ot newer). Capacity is a term associated with storage memory, not the speed.

Don't be mixed by energy and power. They are not the same thing.

As to your question, I would use a different context to explain to you.

XYZ shoe factory noramlly can produce 200,000 pairs of shoes a month which is 100% of it's maxium capacity.

Since the economic down turn, the factory now only at 50% of its capacity.