# Electricity Chapter 11

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1. Electric Circuit
A closed path along which electrons that are powered by an energy source such as a battery can flow.
2. Voltaic Cell
A cell of energy that generates an electric current by chemical reactions involving two different metals or metal compounds separated by a solution that is a conductor.
3. Battery
A connection of cells.

E.G 2 cells connected are 3 V
4. Electrode
1 of 2 terminals in a cell
5. Electrolyte
• A liquid that contains ions which can be
• decomposed by electrolysis.

e.g. Present in a battery.
6. Dry Cell
An electric cell in which the electrolyte is absorbed in a solid to form a paste, preventing spillage.
7. Wet Cell
An electric cell where the electrolyte is a liquid.

E.G Car battery
8. Primary Cell
An electric cell that produces current by an irreversible chemical reaction.
9. Secondary Cell
A cell that can be recharged.
10. Fuel Cell
A cell producing an electric current directly from a chemical reaction.
11. Solar Cell
A device that converts solar radiation into electricity.
12. Terminal
A point of connection for closing an electric circuit.

E.G Terminals of a battery
13. Switch
A device for opening and breaking the connection in an electric circuit.
14. Open Circuit
An electric circuit where the current isn't flowing.
15. Electric current
The flow of electricity through a conductor.
16. Coulomb
The SI unit of electric charge.  It is equal to the charge of approximately 6.241×10^18 electrons
17. Ampere
A unit of electric current which is equal to a flow of one coulomb per second
18. Electrical resistance
A material's opposition to the flow of electric current which is measured using ohms.
19. Resistor
A device having resistance to the passage of an electric current.
A device or the resistance of a device to which power is delivered.
21. Potential difference
• The difference of electrical potential between
• two points.

E.G The potential difference of a cell is usually 1.5 V
22. Volt
The SI derived unit for electric potential difference.
23. Circuit diagram
A simplified graphicalrepresentation of an electrical circuit.
24. Series circuit
A circuit which has its parts connected in series.
25. Parallel Circuit
A closed circuit in which the current divides into two or more paths before recombining to complete the circuit
26. Ohm’s
law
• A law stating that electric current is
• proportional to voltage and inversely proportional to resistance.

E.G V = IR
27. Ohm
The SI unit of electrical resistance,transmitting a current of one ampere when subjected to a potential differenceof one volt.
28. Superconductor
A conductor with no electrical resistance when cooled to a certain point.

E.G. Mercury
29. Non-Ohmic
Resistors have changing ratios, and are defined by their instantaneous resistance