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3 marksResistance, R

CSEC Physics · May/June 2006 · Paper 2 · Question 5(c)(iv)

A household has the following appliances: Heating iron rated at 1200 W, 110 V; Television set rated at 70 W, 110 V; Electrical fan 52 W, 110 V.

Assuming that these devices are connected in parallel across the mains supply, and are switched ON, calculate the TOTAL current drawn from the mains.

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Other parts of this question

  1. 5(a)Complete Table 2 below showing the International Insulation Colour Code.[3 marks]
  2. 5(b)Fuses are sometimes used to protect electrical equipment from excess current. Explain how a fuse works.[3 marks]
  3. 5(c)(i)Calculate the total power consumed by these devices.[1 mark]
  4. 5(c)(ii)These devices are in use for 4 hours per day. Calculate the energy consumed in kilowatt-hours in a 30-day month.[2 marks]
  5. 5(c)(iii)Calculate the bill for the month if each unit of electricity costs 40¢.[2 marks]
  6. 5(c)(v)Fuses are available with the following current ratings: 5A, 10A, 15A, 25A. Select a suitable fuse for protecting these devices.[1 mark]

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