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Electricity Terms

TermDefinition
ammeter measures electric current (the flow of electrons) - connected in series
ampere the unit used to measure current - symbol = A
voltage is a measure of the amount of energy supplied by the power source
voltmeter measures voltage - connected in parallel
volts the unit used to measure voltage - symbol = V
transformer changes the voltage supplied to a device - eg 240 V MAINS reduced to 19V for a laptop
wet cell 2 different metal electrodes and an electrolyte solution eg car battery - acid and metal electrodes
electrode metal conductor
electrolyte fluid that conducts electricity
dry cell contain a conducting paste
photovoltaic cells contain semi-conducting silicon crystals - sunlight knocks electrons off the crystal and they create a current.
Resistance R = As electrons pass along a wire they meet resistance to flow
Resistance factors type of material, length of wire, diameter
Conductors Metals are conductors - the offer very little resistance - copper and aluminium.
Insulators offer very high resistance - wood and plastic
Ohm's Law V = I R
Current I = Capital letter i = amperes
Created by: camwust
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