The power supplied to a typical black-and-white television set is 90 w when the set is connected to 120 v. (a) how much electrical energy does this set consume in 1 hour? (b) a color television set draws about 2.5 a when connected to 120 v. how much time is required for it to consume the same energy as the black-andwhite model consumes in 1 hour?

The electrical energy and time required for it to consume the same energy are and 18 min.

Explanation:

Given that,

Power = 90 W

Voltage V = 120 V

Current = 2.5

(a). We need to calculate the  amount of energy

Using formula of energy

Where, p = power

t = time

Put the value into the formula

(b). We need to calculate the  power

Using formula of power

Where, I = current

V = voltage

Put the value into the formula

We need to calculate the time

Using formula of time

Put the value into the formula

Hence, The electrical energy and time required for it to consume the same energy are and 18 min.

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )

neither accurate nor precise.