Question

An operating television set draws 0.71 ampere of current when connected to a 120-volt outlet. Calculate the time it takes the television to consume 3.0 x 10^5 joules of electronic energy. [Show all work, including an equation and substitution with units]. ** Round to the nearest whole number

Answer 1

3521 s

Step-by-step explanation:

Using

E = VIt...................... Equation 1

Where E = Energy consumed by the television, V = Voltage connected to the television, I = current drawn by the television, t = time.

Make t the subject of the equation

t = E/VI.................... Equation 2

Given: E = 3.0×10⁵ J, V = 120 V, I = 0.71 A

Substitute into equation 2

t = 3.0×10⁵/(120×0.71)

t = 3.0×10⁵/85.2

t = 3.52×10³ s = 3521 s

Hence the time taken for the television to consume 3.0×10⁵ J of electronics energy = 3521 s

Answer 2

3521 seconds

Step-by-step explanation:

The power that the television uses is calculated multiplying the current by the voltage:

P = I * V

with I = 0.71 A and V = 120 Volts, we have:

P = 0.71 * 120 = 85.2 W

To find the time it takes to consume 3*10^5 Joules, we need to know that the total energy consumed is equal to the power times the amount of time, so:

E = P * t

with E = 300000 and P = 85.2, we have:

300000 = 85.2 * t

t = 300000/85.2 = 3521.13 seconds = 3521 seconds