13c_resistance - 13c: Resistance The amount of current...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
13c: Resistance The amount of current flowing in a circuit depends, in part, on the voltage . By increasing the voltage (maybe by using a more powerful battery) you increase the “pumping power” that is moving current through the circuit. Current flow also depends on how the material of the conductor resists the motion of electrons. Gold : an excellent conductor, because its electrons are quite easily moved. Aluminum : not a great conductor, since its electrons don’t move well. We would say that gold has a low resistance , and aluminum has a high resistance . To understand the relationship between voltage , current , and resistance , look at the following analogy. Imagine a water pump that is being used to get some water out of the basement of a house. The people first try using a thin hose, and then a wider hose. The wider hose has a much lower resistance to the water flowing through it, so more water comes out the other end. This is the same way that electricity works: 1. The pump is like voltage : think of voltage (potential difference) as the pumping power that is shoving electrons through the wire. 2. The hose diameter is like the wire’s resistance : a thin hose let’s only a little water through, just like a poor conductor only lets a little current through. 3.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

Page1 / 3

13c_resistance - 13c: Resistance The amount of current...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online