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Questions on EMF and internal resistance

 

Q7.

(a) A steady current of 0.25 A passes through a torch bulb for 6 minutes.

Calculate the charge which flows through the bulb in this time.

(2)

(b) The torch bulb is now connected to a battery of negligible internal resistance. The battery supplies a steady current of 0.25 A for 20 hours.

In this time the energy transferred in the bulb is 9.0 × 104 J. Calculate

(i) the potential difference across the bulb,

(ii) the power of the bulb.

(3)

(Total 5 marks)