Question

In doing a load of clothes, a clothes dryer uses 19 A of current at 240 V for 29 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

The time taken is 6.80 h.

Step-by-step explanation:

The expression for the electric energy in terms of voltage and current is as follows;

E= V'It

Here, V' is the voltage, I is the current and t is the time.

Calculate the electric energy of the clothes dryers.

E= VIt

Convert time taken from minutes to hours.

t= 29 min

`t= (29)/(60)h`

Put I= 19 A, V= 240 V and
`t= (29)/(60)h`.

`E= (240)(19)((29)/(60))`

E= 2204 W

Calculate time which is used to surf the internet on the computer by rearranging the expression for the electric energy.

`t= (E)/(VI)`

Put E= 2204 W, I= 2.7 A and V= 120 V.

`t= (2204)/((120)(2.7))`

t= 6.80 h

Therefore, the time taken is 6.80 h.