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Electricity (resistance (Resistivity : Property of a material (ohm metres)…
Electricity
resistance
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Resistance : property of a component calculated by dividing the pd across it by the current in it (ohms)
:arrow_up: temp :arrow_up: resistance : As +ve ions in wire have more internal energy, so vibrate more, increasing collisions between ions and electrons, more energy transferred
Resistivity : Property of a material (ohm metres), the product of the resistance and cross sectional area divided by length
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Kirchoffs Laws
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1st law : For any point in an electrical circuit the sum of currents into that pint is equal to the sum of currents out
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