Question

In doing a load of clothes, a clothes dryer uses 15 A of current at 240 V for 55 min. A personal computer, in contrast, uses 2.7 A of current at 120 V. With the energy used by the clothes dryer, how long (in hours) could you use this computer to "surf" the internet?

Answer 1

Available usage time for the computer = 10.185 hrs

Step-by-step explanation:

for the dryer;

I = 15 A, V=240 V , t= 55min,

convert time from min to sec. t = 55*60 =3300 sec

Energy = IVt

Energy = 15*240*3300

Energy = 11,880,000 J

=11,800 KJ

using the energy for the clothes dryer to calculate for the time spent on the computer,

Energy = IVt

for the computer;

I = 2.7A V=120V , t=?

`t=(energy)/(IV)`

`t=(11,800,000)/(2.7*120)`

t=36,666.7sec

convert this value to hour by dividing by 3600

`t=(36,666.7)/(3600) \\t=10.185hrs`