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Ohm's law: I=V/R

See, I dont know how to use Ohm's law

For number one, I=0.5 and V=100

so you just back substitute the numbers in: (0.5)=100/R
Next you isolate R.
0.5R=100
R=200

ok, so,
.5 A=100V/X?

yup

so, 50a=x?

no. A is a unit.

It's not a variable. If it helps you, use Amps instead of A

Ok, I don't get this can you walk me through it?

Okay. We know that I=V/R.
We also know that I=0.5Amps and V=100Volts
Do you follow?

What do the things in I=V/r mean?

ok, so its really C=V/R?

We don't use C for current. We use I. This is out of habit, so use I okay?

ok

ok

so 0.5=100/R

yes.

now where do i go from there?

Multiply both sides by R.

so,0.5R=100?

Yup.

ok, so
divide by .5?

R=100/0.5
R=200

Yes.

Can you do number 2?

btw, the units for the resistance are in ohms.

no, power is P=IV x.x

sorry they are different formulas.

100 watts

ok

Do you need help with the rest?