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Module 4 Electricity

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Terms in this set (24)

Rate of flow of charge

One coulomb is the electric charge flowing past a point in one second where there is current of one Ampere

Net charge on and object

Plus or minus n e

Charge on an object is quantised as charge can I me have certain values and must be integer multiples of e

Conventional current

When the current in a circuit flows from the positive terminal to the negative terminal

Mean drift velocity

The average velocity of the Carrier charge as it travels through a wire

Current depends on

The mean drift velocity

Current will double if either n or A or V is doubled

Potential difference

Measured across a component is the energy transferred per unit charge

Electromotive force

Energy gained per unit charge

Is the potential difference divided by the current

A component has a resistance of 1 Ohms of a p D of 1 volt makes a current of 1 Ampere flow though it

I'd the physical conditions remain constant the current through a conductor is directly proportional to the potential difference across it

Resistivity is dependent on

The temperature (if the temperature increases the Resistivity increases)

Resistivity of metals

Is lower that semi conductors