Download - Eletrodinâmica (1) – Resistores
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ResistorTransformar energia elétrica em energia térmica.
Limitar a corrente elétrica em um circuito.
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Resistor
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Resistor
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Resistor
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Resistor
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Resistor
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Resistor
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Resistor
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Resistor
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Resistor
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Resistor
Circuitos elétricos
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Resistor
Circuitos elétricos
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Resistor
Circuitos elétricos
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Resistor
Circuitos elétricos
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Símbolo
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Leis de Ohm1ª. Lei de OhmMantendo-se constante a temperatura de um resistor, a diferença de potencial aplicada nos extremos é diretamente proporcional à intensidade da corrente elétrica que o percorre.
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Leis de Ohm1ª. Lei de Ohm
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Leis de Ohm
.2
2
1
1 ConstiU
iU
RiU
iRU .Resistência
1ª. Lei de Ohm
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Leis de Ohm
iRU .1ª. Lei de Ohm
Resistor Ôhmico
) θ
tgR
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Leis de Ohm
iRU .][][][iUR
ampèrevoltR ][
AVR ][
][R (Ômega)(Ohm)
Unidade de medida (R)
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Leis de Ohm1ª. Lei de Ohm
iRU .
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Leis de Ohm1ª. Lei de Ohm
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Leis de OhmResistores NÃO ÔHMICOS
Resistência elétrica NÃO é CONSTANTE.
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Leis de Ohm2ª. Lei de Ohm
A resistência elétrica de um condutor homogêneo e de secção transversal constante é diretamente proporcional a seu comprimento (L), inversamente proporcional a sua área transversal (A) e depende do material de que ele é feito.
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Leis de Ohm2ª. Lei de Ohm
LA
Área da secção transversal
Material (ρ)
ALR (ρ): Resistividade
do MATERIAL
Comprimento
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Leis de OhmResistividade (ρ)
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Leis de Ohm2ª. Lei de Ohm
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Leis de Ohm
ALR
iRU .
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Leis de Ohm
).1( TRR o