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4.2 Electrical quantities

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Question 16
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 Electrical quantities Questions

  1. IGCSE
  2. /Physics
  3. /4.2 Electrical quantities

452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.

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