How Everything Works
How Everything Works How Everything Works
 

QUESTIONS AND ANSWERS
 
Question 260

Why does less current flow through a longer wire?
Wires obey Ohm's law: the current flowing through them is proportional to the voltage drop across them. But the precise relationship depends on the wire's length. A short wire will carry a large current even when the voltage drop across it is small because that wire has a small electrical resistance; it does not impede the flow of electricity very much. But a long wire has a large electrical resistance and will only carry a large current if the voltage drop across it is large. If you do not change the source of electrical power (e.g. a battery) and replace short wires with long wires, those wires will not be able to carry as much current.
         

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