A tungsten wire is 28m long and is used in a toaster at 120V. The resistivity of this material is 5.6*10^-8 ohm*m. The radius of the wire is 2.5*10^-4 m. a) What is the resistance of the wire? b) How much energy is delivered to the tungsten wire in 30s?

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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.