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Monday, 17 August 2026
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Physics Past Questions and Answers

Topic: Electrical Energy and Power

Jamb Physics Questions - Electrical Energy and Power

Question 6:
An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is
  • A 62.5A, 4.0\(\Omega\)
  • B 16.0A, 62.5\(\Omega\)
  • C 62.5A, 16.0\(\Omega\)
  • D 4.0A, 62.5\(\Omega\)
  • E 4.0A, 250\(\Omega\)
View Answer & Explanation
Question 7:
Which of the following can be described as high tension transmission?
  • A High resistance and low voltage
  • B Low current and high voltage
  • C High current and low voltage
  • D High voltage and zero current
  • E High current and low resistance
View Answer & Explanation
Question 8:
What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?
  • A N0.65
  • B N0.13
  • C N3.90
  • D N39.00
  • E N234.00
View Answer & Explanation
Question 9:
An electric kettle, connected to a 240V mains, produces 6.0 x 105J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle.
  • A 14.4\(\Omega\)
  • B 28.8\(\Omega\)
  • C 144\(\Omega\)
  • D 288\(\Omega\)
  • E 2880\(\Omega\)
View Answer & Explanation
Question 10:
A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?
  • A N4.80
  • B N48.00
  • C N480.00
  • D N4800.00
View Answer & Explanation