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Course: Igcse Physics
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Curriculum

Igcse Physics

1. Motion, Forces and Energy

0/161 Dr Dabour Hub Science Diagram and Course Material

2. Thermal Physics

0/75 Dr Dabour Hub Science Diagram and Course Material

3. Waves

0/77 Dr Dabour Hub Science Diagram and Course Material

4. Electricity and Magnetism

0/119 Dr Dabour Hub Science Diagram and Course Material

5. Nuclear Physics

0/39 Dr Dabour Hub Science Diagram and Course Material

6. Space Physics

0/47 Dr Dabour Hub Science Diagram and Course Material
Quiz

4.2.10 Resistance of a Wire – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
If the length of a wire is doubled, its resistance
halves
doubles
quadruples
is unchanged
2.
A wire has resistance R. A wire of the same material and length but double the cross-sectional area has resistance
R / 2
2R
R / 4
4R
3.
A wire has resistance 8.0 Ω. Another of the same material is twice as long and has twice the area. Its resistance is
4.0 Ω
16 Ω
32 Ω
8.0 Ω
4.
A graph of R against l for a wire at constant temperature is
a curve upwards
a horizontal line
a straight line through the origin
a straight line with a negative gradient
5.
Why should the current be switched off between readings?
To save the cell
To stop the wire heating, which would raise its resistance
To make the ammeter reset
To lower the voltage
6.
A heating element is made from a wire with high resistance because
it makes more heat for a given current
it carries a larger current
it has no free electrons
it is cheaper
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Part of 4. Electricity and Magnetism — see every lesson and quiz in this unit.
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