Presentation on theme: "Contact Points and Light Bulbs"— Presentation transcript:
1 Contact Points and Light Bulbs Physics FirstUnit 1 Electricity
2 Contact Points All electrical points have contact points Contact points- allow electrical current to flowInside the device there is a pathway (without breaks) so current can flow
3 Contact PointsAll 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 outContact points must be separated by some insulator
4 Anatomy of a Light Bulb3. filament wire- current passes through and creates heat which turns to light4 and 5- contact wires that connect to filament9 and 11- outside contact points insulated by 108- 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 out6. Support wires- no electrical purpose7. Stem- glass mount
6 SymbolsResistor- (light bulb, motor, buzzer) device that a current can cross
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