# Physics-Electricity.txt

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The flashcards below were created by user richardive on FreezingBlue Flashcards.

1. Outline electrical conduction.
• Conduction is due to the movement of the free electrons (transferring charge around a circuit);
• metals are a good electrical conductor with large numbers of free electrons;
• insulators are bad conductors with few/no free electrons;
2. Define electromotive force (emf)
The work done per unit charge in moving a quantity of charge completely around a circuit / the power delivered per unit current / work done per unit charge made available by the source;
3. Describe how the resistance of a wire leads to a greater dissipation of power.
• The resistance of a conductor increases with increasing temperature;
• increased power (dissipation) leads to a higher temperature in the resistor / resistor heating up;
4. Define ideal ammeter and ideal voltmeter
• Ideal ammeter has zero resistance;
• ideal voltmeter has infinite resistance;
5. Define electronvolt
• The energy gained by an electron when accelerated through an electric field with a potential difference of 1V;
• 1.6x10^-19J;
6. The definition of the ampere refers to
The force between parallel current-carrying conductors;
7. State Ohm's Law
• The voltage is (directly) proportional to current / the ratio of potential difference to current is a constant called resistance / the resistance of a conductor is constant provided its temperature is
• constant;
8. Describe a potential divider.
• Consists of two resistors in series or a potentiometer;
• whereby the voltage traveling

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 Author: richardive ID: 217790 Filename: Physics-Electricity.txt Updated: 2013-05-05 07:57:18 Tags: Physics IB Folders: Description: pojaedpgojav Show Answers:

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