Electricity

1. Types of Circuits

1.1. Series

1.2. Parallel

2. A current can only flow in a closed circuit.

3. Issues to consider

3.1. Electricity Conservation

3.1.1. Turn off electrical appliances when not in use

3.1.2. Use energy-saving models for electrical appliances

3.1.3. Use fans instead of air-conditioner

3.2. Impact on the environment

3.2.1. Global warming

3.2.2. Strain on fossil fuel

3.2.3. Pollution

3.2.4. Injuries to wildlife

4. Materials

4.1. Conductors

4.1.1. e.g., metals

4.2. Insulators

4.2.1. e.g., plastic, wood and rubber

5. Components

5.1. Energy source (e.g., battery)

5.2. Light bulb

5.3. Wire

5.4. Switch

6. Current in a Circuit

6.1. Affected by number of batteries

6.1.1. In series; Higher current

6.2. Affected by number of bulbs

6.2.1. In series; Lower current

6.2.2. In parallel; No change

6.3. Flows only when circuit is closed.