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4 marksElectrical Quantities

CSEC Physics · May/June 2010 · Paper 2 · Question 4(b)(ii)

A 24 V d.c. motor lifted a 25 kg appliance 30 m in 5 s, operating at 100% efficiency.

Calculate the current drawn from the d.c. supply.

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Other parts of this question

  1. 4(a)(i)Explain how this motor works.[5 marks]
  2. 4(a)(ii)Give the purpose of the commutator.[1 mark]
  3. 4(b)(i)Calculate the power provided by the motor.[4 marks]
  4. 4(b)(iii)If the power required to lift the appliance was greater, what effect would this have on the value of the current? Assume the voltage rating remains constant.…[1 mark]

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