The lighting of the bulb is caused by the flow of electric current.
Electric current is the flow of electrons from the negative to the positive terminal.
However, conventional current behaves as if the flow of the current is through positive charge carriers and from a positive terminal to a negative terminal.
When a light switch is turned on, the light comes on immediately because
a. the electrons coming from the power source move through the initially empty wires very fast.
b. the lightbulb may be old with low resistance. It would take longer if the bulb were new and had high resistance.
c. the electrons already in the wire are instantly "pushed" by a voltage difference.
d. the electricity bill is paid. The electric company can make it take longer when the bill is unpaid.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
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