The document discusses electric currents and circuits. It explains that electric charge depends on an imbalance of protons and electrons, which results in a net positive or negative charge. It also discusses how conductors allow charges to flow while insulators do not, and how friction or contact can cause charge transfer. Electric force depends on the product of charges and is inversely proportional to the square of the distance between charges. Batteries provide a source of voltage and current can flow when electrons move. Resistance is determined by voltage and current using Ohm's law. Circuits can be series or parallel, and power is calculated using the power equation. Fuses and circuit breakers prevent overloads by opening the circuit when too much current flows.

1. Chapter 13 Electric Currents and Circuits

2. Goal 1 Explain differing charges and factors that affect electric force

8. Goal 2 Explain how batteries are a source of voltage

11. Goal 3 Explain resistance and use the resistance equation

17. Goal 4 Use schematic diagrams to represent circuits

20. Goal 5 Explain the difference between series and parallel circuits

22. http://www.bbc.co.uk/schools/ks3bitesize/science/physics/electricity_4.shtml

24. http://www.bbc.co.uk/schools/ks3bitesize/science/physics/electricity_4.shtml

25. Goal 6 Use the electric power equation

28. Goal 7 Explain how fuses and circuit breakers prevent electric overload