The heating element of an electric toaster is typically made of nichrome wire (an alloy of nickel and chromium). As a current passes through the wire, the wire heats up, thus toasting the toast. Estimate the overall resistance of a heating element which is 245 cm long with a diameter of 0.5 mm. The coefficient of resistivity for nichrome is 1.1*10-6 Ω•m. (Hint: Treat the heating element as a long straight cylinder). a) 1.37 Ω

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.