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

Answer:

Therefore,

We can use Computer to surf internet for 5.7 hours.

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,

$Heat\ Energy=V\times I\times t$

For Clothes Dryer

Substituting the values we get

$Heat\ Energy=240\times 14\times 1980=6652.8\ kJ$

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

Again we have,

$Heat\ Energy=V\times I\times t$

Substituting the values we get

$6652.8\ kJ=120\times 2.7\times t\\\\t=\dfrac{6652800}{324}=20533\ s$

Time in Minutes,

$Time = \dfrac{20533}{60}=342\ min$

Time in hours again we have to divide minutes by 60

$Time = \dfrac{342}{60}=5.7\ hours$

Therefore,

We can use Computer to surf internet for 5.7 hours.