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Voltage, V

Voltage, V. Voltage tells us how hard a positive charge is pushed between two different points. Something, such as a battery, is needed to create a voltage. Current, I. Current tells us the amount of charge flowing through something (similar to gallons per minute).

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Voltage, V

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  1. Voltage, V • Voltage tells us how hard a positive charge ispushedbetween two different points. • Something, such as a battery, is needed to createa voltage. Current, I • Current tells us the amount of chargeflowing throughsomething (similar to gallons per minute). • Current must have a path through which to flow. • Wires provide a path for current flow (and offer nono resistance to the flow).

  2. What Are These? Battery Wires Switch Light Bulb

  3. New Symbols Battery Switch

  4. Old Circuit Drawing

  5. New Circuit Drawing

  6. How Much Current Flows? Zero. This is an “open circuit.” Switch is open.

  7. How Much Current Flows? TOO MUCH!!! This is a “short circuit.” Switch is closed.

  8. How Much Current Flows? Light bulb has resistanceto flow of charge. Amount of resistance is some number R.

  9. Resistor Symbol R

  10. Electrically: Light Bulb = Resistor Current, I = V / R

  11. LED: A Different Kind of Light Bulb • LED = Light Emitting Diode • Current can only flow in one direction(in direction of arrow). • Light only emitted when current flows. • A lot of current may flow if a largelarge voltage is across an LED.

  12. Dangerous LED Circuit When switch is closed, too much current may flow! Almost behaves as a short circuit. Need to modify circuit to limitcurrent…

  13. Good LED Circuit When switch is open, light is off. When switch is closed, light is on. Resistor limits current flow.

  14. Good LED Circuit 5V0 GND

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