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Electricity_Terms
Electricity - Static and Current - Definitions
Electron | A negatively charged particle that orbits around a nucleus. Electrons in metal elements are free to move. |
Copper | A metal that is a very good conductor of electricity (and heat) |
Positively charged object | An object that has fewer electrons than protons (protons are trapped inside the nucleus, electrons are free to move) |
Negatively charged object | An object that has more electrons than protons(protons are trapped inside the nucleus, electrons are free to move |
Static electricity | Electrons are transferred from one object to another, but stay stationary on the object after the initial transfer |
Current electricity | Electrons are moving through a circuit |
Circuit | A path through which electrons flow. Basic components of a circuit are: battery, copper wire, a load (or resistor) and a switch (*for grade 9 science) |
Load Or Resistor | A circuit element that resists the flow of electrons A circuit element that uses electrical energy and converts it to another form |
Copper Wire | Wire made of copper with very little resistance Electrons flow freely inside a copper wire |
Switch | A circuit element that physically breaks a circuit (switch is OFF) or completes a circuit (switch is ON) |
Battery | A source of electrical potential energy for electrons Chemical reaction inside the battery Has positive and negative terminal |
Series Circuit | A circuit where the electrons have only one path through each of the resistors |
Parallel Circuit | A circuit where the electrons have two (or more )paths - some electrons go through one resistor and some go through the other resistor |
Electric Potential | The electrical energy available in ONE Coulomb of charge. Symbol is V. Unit is V (*yes, both the symbol and the unit use the same letter!) |
Coulomb, C | Unit of electrical charge 1 Coulomb = 6.25 x 10^18 electrons |
Electric Potential Difference | The difference in electric potential before an after a resistor or before and after a battery. Symbol is V. Unit is V (*both symbol and unit use the same letter) |
Volt, V | Unit of electric potential 1Volt = 1Joule/1 Coulomb. 1V = 1J/1C |
Joule, J | Unit of energy |
Ampere, A | Unit of current 1Ampere = 1 Coulomb/1 second 1A = 1C/1s |
Current | The flow of charge past a point in a circuit per unit second. Symbol is I Unit is A |
Charge | The number of electrons Symbol is Q Unit is C |