Skip to content

Course home

Sign up

4.2.4a Resistance

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647
Question 31

An electric filament lamp has "230 V,46 W230\text{ V}, 46\text{ W}230 V,46 W" marked on it. Its filament is a coiled coil of fine tungsten wire.

a.

To emit bright light, the filament has to reach a very high temperature. Suggest why design features such as coiling the filament help to achieve this high temperature.

[2]
b.

If your hand is close to the lamp when it is switched on for a few seconds, you can feel warmth from the lamp but the glass will remain cool.

By what method has the thermal energy reached your hand?

  • conduction
  • convection
  • evaporation
  • radiation
[1]
c.

The markings on the lamp give electrical information about the lamp when it is operating normally. State the value of:

  1. the normal operating potential difference across the lamp,
  2. the power of the lamp.
[2]
d.

When the lamp is working normally, its resistance is 1150 Ω1150\ \Omega1150 Ω.

Calculate the current in the lamp.

[2]
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.

Question bank