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Electric Current Notes

This is a sample of our (approximately) 3 page long Electric Current notes, which we sell as part of the Physics AS Level Notes collection, a A package written at Manchester High School For Girls Sixth Form in 2013 that contains (approximately) 36 pages of notes across 13 different documents.

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Electric Current Revision

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Unit 1: 4 Electric Current

CURRENT AND CHARGE CURRENT IS THE RATE OF FLOW OF CHARGE
∆Q = I∆t

or

I = ∆Q
∆t

Current = change in coulombs time taken

The Coulomb is the unit of charge; One coulomb (C) is defined as the amount of charge that passes in 1 second when the current is 1 ampere. Current is measured in amperes, you can measure it using an ammeter connected in series. NB: Charge of an electron = 1.6 x 10-19 (given in formula booklet)

Charge carriers; Current is due to the passage of charged particles called charge carries (electrons or ions). They can be classified as conductors (metals), semiconductors and insulators (non-metals).

KIRCHHOFF'S FIRST LAW: the total current entering a junction must equal the total current leaving the junction

POTENTIAL DIFFERENCE POTENTIAL DIFFERENCE IS THE WORK DONE (OR ENERGY TRANSFER) PER UNIT CHARGE V = W Q

Potential difference = work done

charge

The volt is the unit of potential difference; 1 volt = 1 joule per coulomb or 1V = 1JC-1 Potential difference is measured using a voltmeter connected in parallel.

POWER POWER IS THE RATE OF TRANSFER OF ENERGY P=VI

Power = potential difference x current

total energy (J) = power x time

therefore E = VIt

Power is measured in watts; 1W = 1Js-1 PHYSICS AS NOTES

13

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