PHYSICS

JAMB 2005 - Question 22

Physics 2005 JAMB Past Questions - Question 22: a car battery rated 45H is charged with a charger whose rating is 2.5 how long will it take to charge the battery fully

Choose the correct answers from the options given.
a car battery rated 45H is charged with a charger whose rating is 2.5 how long will it take to charge the battery fully
A:
B:
C:
D:
Examkits App

Examkit's JAMB CBT App

Practice JAMB offline with our Online, PC and Mobile App

  • ✅ 25+ years of past questions (2000 to 2025)
  • ✅ Video solutions and explanation to questions
  • ✅ E-library
  • ✅ Study by topic
  • ✅ And more.

Correct Answer

D

Explanation

For a car battery rated 45AH, being charged by a charger of 2.5A rating, the time for the battery to be fully charged is given by T = 45/2.5 = 18hrsTo calculate how long it will take to fully charge a car battery rated at 45 ampere-hours (Ah) with a charger rated at 2.5 amperes (A), you can use the formula:

Time (in hours) = Battery Capacity (in Ah) / Charger Current (in A)

Time = 45 Ah / 2.5 A

Time = 18 hours

So, it will take approximately 18 hours to fully charge the 45 Ah car battery with a 2.5 A charger, assuming ideal charging conditions and no significant loss of efficiency. In reality, it may take a bit longer due to factors like charger efficiency and the state of charge of the battery when you start charging.