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4.2.4a Resistance

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Question 8
a.

State the relationship between:

(i) the resistance RRR and the length LLL of a wire of constant cross-sectional area,

(ii) the resistance RRR and the cross-sectional area AAA of a wire of constant length.

[2]
b.

A 100 W100\text{ W}100 W filament lamp AAA is connected to a 240 V240\text{ V}240 V supply.

Calculate the current in the filament.

[2]
c.

Lamp BBB has a filament made of the same metal as the filament of lamp AAA in (b).

This filament has twice the length and three times the cross-sectional area of the filament of AAA.

Lamp BBB is also connected to a 240 V240\text{ V}240 V supply.

Calculate the ratio

current in filament of Bcurrent in filament of A \frac{\text{current in filament of } B}{\text{current in filament of } A} current in filament of Acurrent in filament of B​

Show your working.

[3]
Markscheme

4.2.4a Resistance Questions

  1. IGCSE
  2. /Physics
  3. /4.2.4a Resistance

132 exam-style questions on CIE IGCSE Physics 4.2.4a Resistance. Each one has a worked solution and a mark scheme showing where the marks go.

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