A device consumes 100 W of power when connected to a 120 V source. Calculate its resistance. 
 

culture07

4 years ago

p=v²/r
p=100
v=120
r=?
r=v²/p
r=120²/100
r=14400/100
r=144

Feranmiiiiiiii

4 years ago

i don’t understand too
it’s meant to be P=VxV/R
100=120x120/R
100=14400/R
R=14400/100
R=144

Kenhinde

4 years ago

And, it's.Resistance=V×V(voltage)/watt(power)

PaulSharonEnor

3 years ago

current is in ampere while power is in watt. we are meant to use the formula p= v²/r and the answer will be 144 ohms....nawa o

Kenhinde

4 years ago

Nahh,I disagree, it's Power is 100W,And not current.current is in ampere, while,power is in watt.wow,They totally failed this question for me.

Nomisavage

2 years ago

P=V^2/R
: R=V^2/P
R= 120^2/100
R= 14400/100 = 144 ohms

OsueneneDavid

2 years ago

We where given power and volt not current

trustme69

2 years ago

This is extremely wrong, I'm losing confidence in this platform daily

Franklyn05

4 years ago

i don't understand too

Boss4forlife

6 months ago

Use can also use the formula P=IV and V=IR

Magret1

1 year ago

The answer is supposed to be 144ohms since it is resistance we are asked to find

hussein43

2 years ago

the answer is supposed to be 144 ohms how did u get your answer my school..we need explanation..my colleagues have explained the process up there i hope u can make yur correction