Five cylindrical resistors are made of the same material. Their lengths and radi

Question

Five cylindrical resistors are made of the same material. Their lengths and radii are wire 1: length L, radius r wire 2: length L, radius r/2 wire 3: length L2, radius r/2 wire 4: length 2L, radius r/2 wire 5: length 2L, radius 2r Rank the wires according to their resistances, least to greatest. 1,2,3,4,5 5,4,3,2,1 5,1 and 2 tie, 3,4 1,3,4,2,5 5,1,3,2,4 Tungsten has a temperature coefficient of resistivity of 45 times 10-3 degree C1. When a lamp is plugged into a 120 V electrical outlet, the tungsten filament in the light bulb acts as a resistor. What happens to the resistance of the filament as it heats up? it increases it decreases it stays constant it forces the voltage to change When a resistor is connected to a real battery in an ordinary closed circuit, the internal resistance of the battery causes the current in the circuit to be more than it would be if connected to an ideal battery the same as it would be if connected to an ideal battery less than it would be if connected to an ideal banery it depends on the size of the connected resistor Which of the following equations is correct when writing down the junction rule for the circuit in fig 4? I1 = I2 + I3 I1 + I2 = I I1 + I3 = I2 -I1RI - I2R2 = 0 + I1R1 + I2R2 = 0

Explanation / Answer

1) e 2) a 3) c 4) b

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