Flashcards
4.1-Charge and current
Flashcards do conjunto (12)
- 1what is electric current?electric current is the rate of flow of charge
Q/T - 2what is the unit for chargecharge is measured in coulombs
- 3what is the elementary charge?the elementary charge of an electron is -1.6*10^-19
the elementary charge on a proton is +1.6*10^-19 - 4what is the net charge of a particle?the net charge of a charged particle is will always be a multiple of "e" because it has a whole number of electrons
- 5what are currents in terms of metals and electrolytes?currents in metals are caused by delocalised electrons that are free to move randomly and therefore carry charges. good conduction
An electrolyte is made up of charged positive and negative ions, made when ioninc compound dissolved in water or melts - 6what is the conventional current?the idea that a current in the circuit flows from positive terminal to negative terminal
- 7what is electron flowthe idea that the charge carriers in metals are electrons and charge is carried from negative terminal to positive
- 8what is kirchoffs first law?the idea that charge can neither be created or destroyed, it is conserved.
the sum of charges and also current flowing into a circuit junction must equal the sum leaving it - 9what is mean drift velocity?Mean drift velocity is the average rate at which electrons are moving through metal. Calculated by I = A*n*e*v
- 10What are conductors and semiconductors?Conductor metals have a very large value of "n", (number of free conduction electrons per m^2) they are good conductors
Semiconductors have values of n between conductors and insulators. intermediate conduction properties - 11What are insulatorsInsulators have very few free flowing electrons. Poor conductors with n close to zero
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Informações
- Descrição
- A level Physics (Unit 4: Electrons, waves and photons) FlashCards sobre 4.1-Charge and current, criado por Daniel Nnajiuba em 05-01-2019.
- Criado por
- Daniel Nnajiuba
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