Question

Observe the graph showing the amount of power stored over the course of time in a solar panel and determine the equation.

In how many hours does the panel store 1,250 W?

• A. 3
• B. 2
• C. 5
• D. 6

Answer 1

The correct option is C 5

Consider two points on the given line, say (0,0) and (2,500).
$y=mx$

$=\frac{\Delta y}{\Delta x}x$

$=\frac{(500-0)}{(2-0)}x$

$=\frac{500}{2}x$

$=250x$

So, the equation of power stored in the solar panel is,
$y=250x$

Let us find time taken for 1,250 W.
We know that $\text{y}=250\text{x}$

Putting value of $y=1,250$, we get,
$1,250=250x$
$x=\frac{1250}{250}$
$x=5$

$\therefore$ The time taken to store 1,250 W by the panel is 5 h.