Step 1: How to Draw a Light Bulb.
Draw a circle

Step 2: How to Draw a Light Bulb.
Draw a small line on the circle in its one fourth part

Step 3: How to Draw a Light Bulb.
Now make a square using the horizontal line as a base

Step 4: How to Draw a Light Bulb.
Join the circular portion with a square through a line

Step 5: How to Draw a Light Bulb.
Draw a curve parallel to one side of the square

Step 6: How to Draw a Light Bulb.
Draw continuous curves platted on one another for the bottom portion of the bulb

Step 7: How to Draw a Light Bulb.
Now outline the whole picture giving a shape of the bulb

Step 8: How to Draw a Light Bulb.
Erase the guidelines

Step 9: How to Draw a Light Bulb.
Draw two parallel lines inside the bulb and stretch it upwards with a bend. Make two parallel lines inside it. Again extend these two wires placing them at a distance. Connect the two with a zig-zag pattern. The structure of the filament is complete now

Step 10: How to Draw a Light Bulb.
Sketch the holder of the bulb with marks to make it look shiny

Step 11: How to Draw a Light Bulb.
Give a shiny look to the bulb also with pointed marks

Step 12: How to Draw a Light Bulb.
Make small lines around the bulb to make it look glowing

Step All together.