view Conceptual Example 7 as an aid in solving this problem. A portable electric heater uses 21.8 A of current. The manufacturer recommends that an extension cord attached to the heater receive no more than 1.16 W of power per meter of length. What is the smallest radius of copper (resistivity 1.72 x 10-8 Ω·m) wire that can be used in the extension cord? (Note: An extension cord contains two wires.)
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
Review Conceptual Example 7 as an aid in solving this problem. A portable electric heater uses 21.8 A of current. The manufacturer recommends that an extension cord attached to the heater receive no more than 1.16 W of power per meter of length. What is the smallest radius of copper (resistivity 1.72 x 10-8 Ω·m) wire that can be used in the extension cord? (Note: An extension cord contains two wires.)
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