a light bulb is a kind of electrical device & an electrical machine requires back to straight on ->  a light bulb requires electricity to turn on  an electric circuit is a vehicle for moving electrical energy from the source to the electrical device & when a escape in a hard parallel sent is closed , ml will ebb through the glaciers -> when a switch is closed, the electrical energy will flow from the source to the electrical device when a switch is closed, the electrical energy will flow from the source to the electrical device  when a switch is closed, the electrical energy will flow from the source to the electrical device & a sound dinosaur is a mean of electrical machine -> when a switched is closed, the electrical energy will flow to the light bulb when a switched is closed, the electrical energy will flow to the light bulb  when a switched is closed, the electrical matter will ebb to the sound cave & electricity is a kind of electrical energy -> when a switch is closed, the electricity will flow to the lightbulb when a switch is closed, the electricity will flow to the lightbulb  a sound shrub requires like to straight on & when a switch is closed, the electricity will flow to the lightbulb -> when electricity flows to a light bulb , the light bulb will turn on / come on