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Contact Points and Light Bulbs

Contact Points and Light Bulbs. Physics First Unit 1 Electricity. Contact Points. All electrical points have contact points Contact points- allow electrical current to flow Inside the device there is a pathway (without breaks) so current can flow. Contact Points.

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Contact Points and Light Bulbs

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  1. Contact Points and Light Bulbs Physics First Unit 1 Electricity

  2. Contact Points • All electrical points have contact points • Contact points- allow electrical current to flow • Inside the device there is a pathway (without breaks) so current can flow

  3. Contact Points • All devices must have at least 2 contact points (some have more) • One point allows current to flow in while the other allows current to flow out • Contact points must be separated by some insulator

  4. Anatomy of a Light Bulb • 3. filament wire- current passes through and creates heat which turns to light • 4 and 5- contact wires that connect to filament • 9 and 11- outside contact points insulated by 10 • 8- wire connected to inside contacts

  5. Anatomy of a Light Bulb • 1. Glass bulb- protector • 2. Inside gas- does not allow the filament to burn out • 6. Support wires- no electrical purpose • 7. Stem- glass mount

  6. Symbols • Resistor- (light bulb, motor, buzzer) device that a current can cross

  7. Symbols • Wire • Battery

  8. Symbols • When a switch is opened or closed we must show it in our circuit diagrams

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