JAMB and WAEC Physics questions: Electrical energy and power

24 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Electrical energy and power· JAMB

   A 2 kW electric iron is used for 5 hours. If electricity costs ₦70 per kWh, find the cost.

   • A₦70
   • B₦140
   • C₦350
   • D₦700

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   Explanation and discussion

2. Question 22· Electrical energy and power· JAMB

   A 2.4 kW electric kettle is used on a 240 V supply. The most suitable fuse is

   • A13 A
   • B3 A
   • C5 A
   • D30 A

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   Explanation and discussion

3. Question 23· Electrical energy and power· WAEC

   A 60 W bulb is used for 5 hours a day for 30 days. At ₦50 per kWh, what is the cost?

   • A₦4,500
   • B₦9,000
   • C₦15
   • D₦450

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   Explanation and discussion

4. Question 24· Electrical energy and power· JAMB

   A resistor gets hot when current flows because

   • Aelectrons collide with the atoms of the conductor
   • Bit is magnetic
   • Cit stores charge
   • Dit absorbs light

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   Explanation and discussion