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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?

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Answer:

The electrical energy and time required for it to consume the same energy are
3.24*10^(5)\ J and 18 min.

Step-by-step 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


Q=pt

Where, p = power

t = time

Put the value into the formula


Q=90*1


Q=90*3600


Q=3.24*10^(5)\ J

(b). We need to calculate the power

Using formula of power


P=V* I

Where, I = current

V = voltage

Put the value into the formula


P=120*2.5


P=300\ W

We need to calculate the time

Using formula of time


t= (Q)/(P)

Put the value into the formula


t=(3.24*10^(5))/(300)


t=1080\s


t=(1080)/(60)=18\ min

Hence, The electrical energy and time required for it to consume the same energy are
3.24*10^(5)\ J and 18 min.

User DWoldrich
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