Internal Resistance

Internal Resistance

1. Electric Current

   • When a switch is closed in a circuit, free electrons in the conductor experience an electric field which causes them to move in one direction.
   • Electrons will flow from the negative terminal of a battery to the positive terminal.
   • Energy is provided by a chemical reaction in the battery or by the mains power supply to allow the electron current to flow.

2. Electric Power

   • P = IV
   • Where I is the current through a component and V is the potential difference across a component.

3. Resistive Heating

4. Electromotive Force (e.m.f.)

5. Resistors in series

6. Resistors in parallel

7. Internal resistance

8. Open Circuit