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# Alevel Physic 4.1

### ocr 4.1

Charge carriers (fact) are +/- ions or electrons in an electrolyte, electrons in a conductor
Coulomb the charge supplied by a current of 1 amp in 1 second
Current the rate of flow of charge
Drift velocity the average velocity of an electron when it travels through a wire due to an applied pd
Electromotive force the electrical energy transferred per unit charge from other forms of energy
Kirchoffs first law (due to conservation of charge) the total current flowing into a junction is the same as the total out.
Ohm a volt per amp ( VA-1)
Ohm's Law current through a conductor is proportional to the potential difference across it provided temperature remains constant
Potential difference energy transfer per unit charge from electrical to other forms
Resistance p.d./current
Volt joule per coulomb (JC-1)

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