I'll play.
Photography is the exposure of light. You can think of an exposure like an empty bucket that you wish to fill with water. There are many factors that influence the rate at which the bucket is filled (or under filled or over filled). One factor which influences the amount of light that 'fills' the negative, slide, or sensor would is the ISO setting on a digital camera or the film speed on a film camera. The lower the rating, the less sensitive it is to light, and thus, the longer it takes to properly expose it.
Similarly, aperture also influences the rate. A large aperture (small opening) like f/22 restricts the diaphram thus allowing a small amount of light to strike the sensor, or in the analogy, filling the bucket slowly. A small aperture (large opening) like f/1.8 dialates that diaphram thus allowing a large amount of light to strike the sensor/film (fills the bucket quickly).
Finally, the shutter speed influences the rate. A high shutter speed (1/8000) would let a very small amount of light to hit the sensor while a slow shutter speed (1/8 ) keeps the shutter open longer allowing more light to expose the film. These three factors work in conjunction to expose the film/sensor to create a properly exposed image. A byproduct of a fast shutter speed is that it 'freezes' the action (i.e., sports photography) while a slow shutter speed tends to have a blurring effect of motion (e.g. creating a 'wispy' effect on a water fall)
These factors can be similarly manipulated to either creatively under/over expose the image. Hence, the film/sensor is analogous to filling an empty bucket with water.
How's that for someone who has never taken a photography class/read a photography book? Do I pass?
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