Resistivity and Resistance
Practice!
| Practice 5.3.1 |
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Two cylindrical resistors are made of the same material (same resistivity  ). Resistor 2 is twice as long and has twice the diameter of resistor 1. What is the ratio R2/R1? |
| Practice 5.3.2 |
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| A wire of resistance R is stretched uniformly until it has twice its original length. What happens to the resistance? HINT: The wire’s density will not change, which means you cannot change the volume of the wire by stretching it. (Volume = length*cross sectional area) |
| Practice 5.3.3 |
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| A metal wire of resistance R is cut into three equal pieces that are then placed together side by side to form a new cable with a length equal to one-third the original length. What is the resistance of this new cable? |
| Practice 5.3.4 |
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 When does an incandescent light bulb carry more current? |
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