The current in a simple electrical circuit is inversely proportional to the resistance. If the current is 20 amperes ( an ampere is a unit for measuring current) when the resistance is 3 ohms, find the current when the resistance is 7.4 ohms.

Question

anonymous · Answer

Oh my apologies it was on my math hw so i posted it here lol

anonymous · Answer

hmm yeah it's kinda

anonymous · Answer

3 - 1/20
7.4 - 1/x

3/x=7.4/20
x=3*20/7.4

anonymous · Answer

it says it is supposed to be a proper fraction.

anonymous · Answer

can't you convert it to proper function yourself? :)

anonymous · Answer

yes i can im just no good at it so i might get it wrong lol... and i usually just post problems i got wrong on here so i prolly wrote it wrong lol

anonymous · Answer

post what you got and i will check if it's correct :P

anonymous · Answer

so im just solving for that x up there and posting what i get just making sure haha

anonymous · Answer

yeah

anonymous · Answer

ok here it goes haha

anonymous · Answer

so what you got?

anonymous · Answer

i got 8.1081 repeating what is that as a fraction?

anonymous · Answer

don't use calculator :P

anonymous · Answer

im no good at making decimals into fractions i suck at mental math haha

anonymous · Answer

use paper! :P

anonymous · Answer

I meant to say i suck at all math haha

anonymous · Answer

$$7.4=\frac{74}{10}$$
and you can even simplify it

anonymous · Answer

haha... wait i thought i was simplifying the number i got?

anonymous · Answer

that = 37/5

anonymous · Answer

now what haha

anonymous · Answer

yeah

anonymous · Answer

3*20=60

anonymous · Answer

$$\frac{60}{7.4}=\frac{60}{\frac{37}{5}}$$

anonymous · Answer

so now what do i do?

anonymous · Answer

do you know how to flip?

anonymous · Answer

No i do not... sorry

anonymous · Answer

you can change division by multiplication and inversing it

anonymous · Answer

$$\frac{60}{7.4}=\frac{60}{\frac{37}{5}}=60\cdot\frac{5}{37}$$

anonymous · Answer

you notice how I do it?

anonymous · Answer

so multiply that... so i got it wrong by doing it on the calculator

anonymous · Answer

no, you got same answer

anonymous · Answer

yes i do... and i did the multiplication and came up with the same answer

anonymous · Answer

$$\frac{14}{\frac{2}{7}}$$
solve this yourself so you broaden your skills :P

anonymous · Answer

ok haha how do i solve it... by flipping it again or just solve as is?

anonymous · Answer

yeah by flipping

anonymous · Answer

ok so it would be 14*2/7 correct?

anonymous · Answer

I got the answer 4... is that right?

anonymous · Answer

no

anonymous · Answer

dang i tried :/ what did i do wrong?

anonymous · Answer

you didn't flip, you just changed to multiply

anonymous · Answer

didn't inverse

anonymous · Answer

Oh so it is supposed to be 14* 7/2 my bad.