Def: Electricity is a form of energy
 | Electricity is the flow of charge. |
| All electrical devices in our homes change electricity from one form to another. |
| A battery provides the difference in electrical pressure necessary to drive electricity round a circuit. |
| Electric pressure is called potential difference and is measured in volts (V) |
| The volt is named after Alessandro Volta |
| Electricity will flow if there is potential difference and a complete circuit. |
| If energy is used in passing electricity through an object, that object is a resistor. |
| The unit of resistance is the ohm. |
| Electrical energy is changed to heat energy in a resistor |
Def: An electrical current is the flow of electrical charge.
| Electric current is measured in amperes (amps). |
| To measure electric current we use an ammeter. |
| Andre Ampere was a French physicist who demonstrated that electrical currents produce magnetic fields. |
| Series Circuits: Bulbs connected in series are connected one after another. |
| Parallel circuits: Bulbs connected in parallel are side by side in a circuit. (e.g. house lights) |
| Current flows from + to -. |
| The long line = positive |
| The short line = negative |
| Ammeter always connected into a circuit in series. |
| A voltmeter is always connected into a circuit in parallel. |