Question

Determine the power delivered to an element at t=4 ms if the current through the element is given by

i=7cos60πt A
and the voltage is related to the current by the relationship v=4i

Answer 1

Explanation:

Given Determine the power delivered to an element at t=4 ms if the current through the element is given by  i(t) = 7 cos 60πt A and the voltage is related to the current by the relationship v = 4 i  

• Now p(t) = ν(t) i(t)
•               = 4i(t^2)
•               = 4 x 49 cos^2 60 πt W
•               = 196 cos^2 60 πt W
•       So p(4 ms) = 196 cos^2 0.24 π
•                         = 0.71284 x 196
•                         = 139.717 W

Reference link will be

https://brainly.in/question/5256201

Answer 2

Answer:

104

Explanation:

The power can be calculated by p=vi

We know that i is 7*cos(60*π*t) and v is 4i. It means 4 times i and t is 0.004

So p=4*7*cos(60*π*0.004)*7*cos(60*π*0.004). Important you must use the calculator in radians

p= 104.153 ≈ 104 Watts