Subelement I: Power Sources— Topic 60: Batteries-1
Question 3-60I5
Element 3 (GROL)The average fully-charged voltage of a lead-acid storage cell is:
Explanation
Lead-acid storage cells, a common power source in amateur radio for station backup and mobile operations, have a nominal voltage of 2 volts per cell. When fully charged, the electrochemical reaction within the cell yields a slightly higher open-circuit voltage. This potential typically measures between 2.06 and 2.2 volts per cell, with 2.06 volts representing a common average for a fully charged state at rest.
Options A (1 volt) and B (1.2 volts) are far too low for a lead-acid cell; 1.2 volts is characteristic of Nickel-Cadmium (NiCd) or Nickel-Metal Hydride (NiMH) cells. Option C (1.56 volts) is also incorrect, as this voltage is typical of single-use alkaline or carbon-zinc cells. Understanding these specific voltages is crucial for proper battery charging, monitoring, and application in amateur radio.
Related Questions
3-60I3 What capacity in amperes does a storage battery need to be in order to operate a 50 watt transmitter for 6 hours? Assume a continuous transmitter load of 70% of the key-locked demand of 40 A, and an emergency light load of 1.5 A.3-60I4 What is the total voltage when 12 Nickel-Cadmium batteries are connected in series?3-60I6 A nickel-cadmium cell has an operating voltage of about:3-61I1 When an emergency transmitter uses 325 watts and a receiver uses 50 watts, how many hours can a 12.6 volt, 55 ampere-hour battery supply full power to both units?3-61I2 What current will flow in a 6 volt storage battery with an internal resistance of 0.01 ohms, when a 3-watt, 6-volt lamp is connected?