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Current Electricity
by ER XUE HUI
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Current Electricity

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Electromotive Force (emf)

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SI Unit :

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Definition :

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Formula :

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Measured with :

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Has the same unit as potential difference(p.d.)

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Potential Difference(p.d.)

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Definition:the amount of energy when one coulomb of positive charge passes between the two points

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V=W/Q

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SI Unit: volt(V)

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Measure with a voltmeter parallel to the component of the circuit

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Resistance

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definition:the ratio of potential difference across the conductor and the current flowing in it.

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formula:R=V/I (units:ohm)

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masurement

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fixed resistors &viable resistor(rheostat)

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Current

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Caused by :

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Electron flow opposite to conventional current flow

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Electron flow :

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Measured with :

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Formula :

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Definition :

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