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3 marksElectrical Quantities

CAPE Physics Unit 2 · 2003 · Paper 2 · Question 5(b)(ii)

A length of Nichrome wire with cross sectional area 2.60 x 10^-6 m^2 has a potential difference of 110 V across it. Nichrome has a resistivity of 5.00 x 10^-7 Omega m. The element dissipates thermal energy at a rate of 5 000 W.

Calculate the length of the wire.

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Other parts of this question

  1. 5(a)(i)Explain what is meant by 'drift velocity', v.[2 marks]
  2. 5(a)(ii)Show that the current, I, flowing through the conductor is given by I = n e v A, where n is the number of charge carriers, e is the charge on EACH carrier, v…[4 marks]
  3. 5(a)(iii)Write down an equation defining the resistivity of a piece of metal of length l and cross sectional area A.[2 marks]
  4. 5(b)(i)Calculate the current flowing through the wire.[2 marks]
  5. 5(c)Given that each cubic metre of nichrome contains 9.0 x 10^28 conduction electrons, calculate the drift velocity of the electrons.[2 marks]
  6. 5(d)(i)Calculate the average force experienced by EACH electron due to the field.[2 marks]
  7. 5(d)(ii)Calculate the TOTAL force experienced by the wire due to the field.[3 marks]

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