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How does the resistance of a wire vary with its length?
Member rating: No Rating | Words: | Submitted: Wed Oct 08 2003
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Physics Investigation 2003 How does the resistance of a wire vary with its length? Plan: An electric current is the flow of electrons, which are negatively charged. Metallic Conductors contain free electrons that move randomly around. When a power supply is applied, these electrons flow towards the negative terminal from the positive. This is the flow of electrons that constitutes a current. Electric current is measured in amperes (amps) where one amp = one coulomb per second. On the way around the circuit, the electrons collide into the ions in the conductor. When they collide they lose some of their energy, which slows them down. It is these collisions that constitute resistance. The resistance of a wire tells us how much current will flow through it for a given voltage. Resistance is measured in ohms (?). There are four factors affecting resistance: 1. Type of metal 2. Temperature 3. Cross sectional area 4....
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