Step 1

Here it go.Firstly to make the oval shape to represent the bulb,
i use the ellipse tools. Than I resize the bulb by using the selection tool by clicking on the oval shape. Than i fill the bulb with orange and yellow colour to symbolize as heat that is produce by a bulb by selecting the colour at the swatches on the right side.Than i made the bottom part of the bulb which represent the screw by using the rounded rectangle tool and again i resize and arrange it in order by using the selection tool.As the screw, i use a stroke at size 2pt with white fill.