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4 marksElectrical Quantities

CAPE Physics Unit 2 · 2006 · Paper 1 · Question 1(b)(ii)

A small heater made from nichrome wire with diameter 0.45 mm produces heat at a rate of 25 W from a 9 V supply.

The length of nichrome wire required is 42 cm. Calculate the resistivity of nichrome, stating the correct unit.

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Other parts of this question

  1. 1(a)(i)Give the physical reason why copper is a better conductor than a material such as nichrome.[1 mark]
  2. 1(a)(ii)Sketch a graph on the provided axes showing how the resistance per unit length of a wire varies with its cross-sectional area.[1 mark]
  3. 1(a)(iii)Write an equation relating the resistance per unit length to the cross-sectional area of the wire.[1 mark]
  4. 1(b)(i)Determine the resistance of the heater.[3 marks]

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