Putting the chapter together

Everything the chapter asked you to keep, in one place.

Summary

• When certain materials are rubbed against one another, electrons are exchanged between those materials.
• An electric current is flowing electric charges.
• The direction of the conventional current is from the positive terminal to the negative terminal.
• The potential difference between the terminals of a cell when no current is being drawn from it is the electromotive force of that cell.
• Ohm's law states that, when the temperature is constant, the current flowing through a conductor is proportional to the potential difference between its two ends.
• Electrical resistance is the obstruction to a current flowing through a circuit.
• There are two main ways of connecting resistors in a circuit: the parallel arrangement and the series arrangement.
• The overall resistance of a system of resistors is called the equivalent resistance.

Technical terms