Question

In doing a load of clothes, a clothes dryer uses 14 A of current at 240 V for 33 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

Therefore,

We can use Computer to surf internet for 5.7 hours.

Step-by-step explanation:

Given:

For Clothes Dryer,

Current, I = 14 A

Voltage, V = 240 V

Time, t = 33 min = 33 × 60 = 1980 s

For Computer,

Current, I = 2.7 A

Voltage, V = 120 V

To Find:

Time, t = ? For Computer to surf with the Energy of Clothes Dryer,

Solution:

According to Joule's Law, Energy in joules for voltage "V" and Current "I" for time "t" second is given as,

`Heat\ Energy=V* I* t`

For Clothes Dryer

Substituting the values we get

`Heat\ Energy=240* 14* 1980=6652.8\ kJ`

Now for Computer we have E = 6652.8 kJ, then time will be

Again we have,

`Heat\ Energy=V* I* t`

Substituting the values we get

`6652.8\ kJ=120* 2.7* t\\\\t=(6652800)/(324)=20533\ s`

Time in Minutes,

`Time = (20533)/(60)=342\ min`

Time in hours again we have to divide minutes by 60

`Time = (342)/(60)=5.7\ hours`

Therefore,

We can use Computer to surf internet for 5.7 hours.