Energy and voltage in circuits

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Question 34
Medium

A heavy-duty vehicle headlight (filament lamp) is connected to a 24 V battery.

The headlight is switched on and a high-speed data logger records the current.

The graph shows the results from the data logger.

A graph showing current in A against time in s for a heavy-duty vehicle headlight.

a.

Describe in detail how the current varies with time. Refer to data from the graph in your answer.

[3]
b.

The battery has a voltage of 24 V. The lamp reaches its normal operating temperature after a short while.

State the current in the lamp when it is at its normal operating temperature.

[1]
c.

State the relationship between voltage, current and resistance.

[1]
d.

Calculate the resistance of the lamp at its normal operating temperature. Give the unit.

[2]
e.

State the relationship between power, current and voltage.

[1]
f.

Calculate the power of the lamp at its normal operating temperature.

[2]
g.

Suggest why a filament lamp is most likely to fail when it is first switched on.

[2]

Energy and voltage in circuits Questions

  1. IGCSE
  2. /Physics
  3. /Energy and voltage in circuits