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# Ch 20 2 Electric Current And Ohm’S Law

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### Transcript

• 1. Electric Current and Ohm’s Law 20-2
• 2. Electric Current
• A continuous flow of electric charge.
• Measured in amps (A) = 1 coulomb per second
• Direct current (DC) when charge flows in one direction
• Alternating current (AC) is a flow of electric charge that regularly reverses direction.
• EX – home plugs and lights
• 3. Electrical Conductors and Insulators
• Conductors are materials through which charge can easily flow
• Metals and water
• Insulators are materials through which a charge cannot flow easily.
• Wood, plastic, rubber and air
• 4. Resistance
• Opposition to the flow of charges in a material
• Measured in ohm.
• A material’s thickness, length, and temperature affect its resistance.
• A thinner, longer and hotter wire increase resistance.
• Superconductor has almost 0 resistance
• 5. Voltage
• In order for a charge to flow in a wire, the wire must be connected in a complete loop that includes an energy source.
• Potential difference - difference in potential energy between 2 places in an electric field
• Measured in volts – joules per coulomb
• Batteries convert chemical energy into electrical energy.
• 6. Ohm’s Law
• Voltage (V), in a circuit equals the product of the current(I) and the resistance ( R).
• V = I x R or I = V/R
• Increasing voltage increases current. Keeping same voltage and increasing the resistance decreases the current