7220439
Descrição
Mapa Mental por Rishi Siddani, atualizado more than 1 year ago
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Criado por Rishi Siddani
quase 8 anos atrás
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Electricity module
- Kirchoff's Laws
- 1st: The sum of current going into a junction must
equal the sum of current exiting that junction.
- 2nd: The sum of P.D. must equal the sum of E.M.F.
- 1st: The sum of current going into a junction must
equal the sum of current exiting that junction.
- Resistance
- = Resistivity x length/
Cross sectional area
- As temperature of metal increases, the amplitude of the
lattice ions vibrations increase so the electrons tend to
collide with the lattice ions more often. This reduces the
mean drift velocity and as a result the current.
- = Resistivity x length/
Cross sectional area
- Drift velocity
- I=nAve
- The average velocity at which electrons move
along a conductor towards the positive terminal
- I=nAve
- Voltage
- E=V+Ir
- P.d.=Work Done/Charge
- 1W= 1Js ^-1
- E=V+Ir
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