The heating element of an electric oven is designed to produce 3.8 k of heat when connected to a 240-V source.     Part A What must be the resistance of the element?

A cylindrical aluminum pipe of length 2.16 m has an inner radius of 2.03 × 103 m and an outer radius of 3.44 ×103 m. The interior of the pipe is completely filled with copper. What is the resistance of this unit? (Hint: Imagine that the pipe is connected between the terminals of a battery and decide whether the aluminum and copper parts of the pipe are in series or in parallel.) Number i Units

Part C Determine the voltage across 960 2 resistor. Express your answer to two significant figures and include the appropriate units. HÀ ? Value = U 096A Units Submit Request Answer Part D Determine the voltage across 680 N resistor. Express your answer to two significant figures and include the appropriate units. Figure 1 of 1 HÀ ? V680 2 = Value Units 820 Ω. 680 Ω 960 2 Submit Request Answer 12.0 V Provide Feedback

A conductor has a circular cross-sectional area A, length L, and L resistivity p, as shown. A Suppose you want to double the resistance of the conductor. Would the following changes achieve this goal? i) Yes No Replace the conductor with one made from a material with half the resistivity, keeping everything else the same: ii) Replace the conductor with one made from a material with half the conductivity, keeping everything else the same: Yes No Double the length of the conductor, keeping everything else the same: iii) Yes No Double the radius of the conductor, keeping everything else the same: iv) Yes No Yes Reduce the radius of the conductor by half, keeping everything else the same: v) No