What is the power rating of an LED light bulb if 0.50 A flow through it when connected to an 18 V battery?

9 W

Explanation:

The power rating for an Ohmic device (in which the potential difference is directly proportional to the current flowing through it) is given by

where

P is the power

I is the current

V is the potential difference

For the LED light in this problem, we have:

I = 0.50 A is the current flowing

V = 18 V is the potential difference applied

Therefore, the power rating is:

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day