When electricity flows to a light bulb , the light bulb will turn on.
Materials that control the flow of electricity are called resistors.
Resistors can prevent a light bulb from turning on.
What could prevent a light bult from turning on?
Options:
A) sensory neurons
B) herbicide
C) A resistor
D) focusing a lens
E) evaporation
F) heat energy
G) heating liquids
H) energy barrier