How Much Current Flows Through a 300-W Computer Using 120 V?

[mark9159]

Hey,

I have a question to ask and was wondering if you guys could help me.

5.) A computer has a 300-W power supply. If household voltage is 120 V, how much current will flow through the computer?
A. 0.4 A
B. 2.5 A
C. 180 A
D. 420 A
E. 36,000 A

I picked B. I used the equation Electric power= current x voltage and changed it so current=power/voltage...which is how i got 2.5 A.

thanks,

mark

 

[whozum]

Yup, P = IV, so I = P/V = 300/120 = 2.5

 

[thepatientmental]

Hi Mark,

You are correct! Using the equation P=IV, we can rearrange it to solve for current, which gives us I=P/V. Plugging in the values given, we get I=300W/120V=2.5A. This means that 2.5 amps of current will flow through the computer. Good job on using the correct equation and solving for the correct answer! Let us know if you have any other questions.