What is the role of a switch in an electric circuit?, To produce heat, To open or close the circuit, To store electricity, What happens when more bulbs are added to a series circuit?, The bulbs become dimmer., The bulbs become brighter., The bulbs change color., What happens to the brightness of the bulbs when another bulb is added to a parallel circuit?, The bulbs become dimmer., All bulbs turn off., Brightness stays the same., Plastic is an example of a __________., Conductor, Insulator, Battery, What happens to the light bulb in an open circuit?, It glows., It becomes brighter., It stays off.

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