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A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The...

Physics
JAMB 2000
A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is
  • A. 25%
  • B. 33%
  • C. 50%
  • D. 75%
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Correct Answer: Option D
Explanation
Efficiency = Output/input x 100/1
Efficiency = 3/(3+1) x 100/1
= 3/4 x 100/1 = 75%
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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Join your school's WhatsApp group
Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid