Science 9: Unit 4 - Electricity

Topic 1.1 - Introduction and Static Electricity

Positive Charge: Not enough electrons compared to protons

Negative Charge: Too many electrons compared to protons

Neutral Charge: Balance of electrons and protons

Conductors: Have freely moving electrons, can hold an electric current

- Superconductor: Has no resistance

- Semiconductor: Conductivity depends on temperature, light, etc.

Insulators: Electrons cannot move freely, can have static discharges

Resistors: Allows current to flow, but adds resistance Eg. The filament in lightbulb gets very hot

Law of Electrical Charges:

- Opposite Charges Attract

- Like Charges Repel

- Neutral Objects are Attracted to Charged

Charge Separation: A charged object can approach a neutral object and create a concentration of like charges

Static Electricity: A build-up of electrons on insulators. There is a temporary imbalance of protons and electrons, only changing with a discharge.

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Use this to study for tests.