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Electrostatics

Electrostatics. Electrostatics : The study of electric charges, forces, and fields The symbol for electric charge is the letter ‘ q ’ The SI unit for charge is the Coulomb (C) 1C = 6.25 x 10 18 electrons 1 electron has a charge of 1.60 x 10 -19 C

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Electrostatics

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  1. Electrostatics • Electrostatics: The study of electric charges, forces, and fields • The symbol for electric charge is the letter ‘q’ • The SI unit for charge is the Coulomb (C) • 1C = 6.25 x 1018 electrons • 1 electron has a charge of 1.60 x 10-19 C • Opposite charges attract, Like charges repel • Electrons carry a negative charge • Protons carry a positive charge • Neutrons have no charge

  2. W V q Electric Potential Difference (Voltage) • Potential Difference: The work done to move a positive test charge from one location to another • The SI Unit for Potential difference is the Volt (V) • Commonly referred to as ‘Voltage’ • Comparing electricity to the two tanks of water: • Voltage is the difference in the water level ofthe two tanks

  3. q I t Electric Current • Current: The amount of charge that passes through an area in a given amount of time • The SI Unit for current is the ampere (A) • 1 ampere = 1 Coulomb per second a.k.a. 1 C/s • Current flows when there is a voltage (from a battery) and a path for the charge to flow (a wire, a lightbulb, a resistor, etc) • Comparing electricity to the two tanks of water: • Current is how much water is flowing between the tanks

  4. V I R Resistance & Ohm’s Law • Resistance: An opposition to the flow of charge • The SI Unit for resistance is the ohm (Ω) • 1 ohm = 1 Volt per Amp a.k.a. 1 Ω = 1V/1A • Smaller wires have more resistance • Larger wires have less resistance • Comparing electricity to the two tanks of water: • Resistance is the size of the pipe connecting the tanks

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