Determine the potential difference delta V_ab between points a and b in the figu

Question

Determine the potential difference delta V_ab between points a and b in the figure on the right. Which point has a higher potential? A toaster rated at 1000 W operates on a 240-V household circuit and uses a 4.00 m length of nichrome wire as its heating element. The operating temperature of this heating element is 320 degree C. The resistivity and temperature coefficient of resistivity for nichrome at 20 degree C are 150 times 10^-8 ohm m and 0.4 times 10^-3 J (degree C)^-1 respectively. Find the current drawn by die heating element the resistance of the heating element the diameter of the nichrome wire required.

Explanation / Answer

For making equal currents in the upper and lower arms, the current pass through the central must be zero as per Kirchoff's junction law.

For that the potential difference between the end points of the central arm is zero .

Vab = -8 V

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