electricity [PHY U2]

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Last updated 9:19 AM on 10/10/26
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5 Terms

1
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what is the formula for resistivity

R = (p x l) / A

pl = R x A

p = (R x A ) / l



p(rho) = resistivity in Ωm

l = Length of the material

A = C.Area, R = resistance

<p>R = (p x l) / A<br><br>pl = R x A<br></p><p><strong>p = (R x A ) / l</strong><br><br><br><br><strong>p(rho) </strong>= resistivity in Ωm<br><br><strong>l =</strong> Length of the material<br><br>A = C.Area, R = resistance</p>
2
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define emf and state the formula relating to it

The amount of chemical energy converted into electrical energy per unit charge

E = Ir + IR

<p><strong><u>The amount of chemical energy converted into electrical energy per unit charge</u></strong><br><br><strong><u>E = Ir + IR</u></strong></p>
3
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state the expression for ‘lost volts’

state the expression for terminal potential difference

‘lost volts’ = Ir

terminal potential difference/p.d = IR

<p>‘lost volts’ = <strong>Ir</strong><br><br>terminal potential difference/p.d = <strong>IR</strong></p>
4
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state the formula that relates current to drift velocity

I = nqvA

OR

I = nAve

(e or q = number density of charge carrier C)

v = drift velocity or avg. drift velocity of carrier charges

5
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define superposition

  • the overall displacement when two or more waves overlap/meet

  • this is the vector sum of the displacements caused by each individual wave


<ul><li><p>the overall displacement when two or more waves overlap/meet <br></p></li><li><p>this is the<strong><u> vector sum of the displacements caused by each individual wave</u></strong></p></li></ul><p></p>