Question

Nickel-Cadmium (Ni-Cd) battery is used in
1. Calculator
2. Cordless electronic appliances
3. Transistors
4. All of the above

Answer 1

Correct Answer - Option 2 : Cordless electronic appliances

The correct answer is Cordless electronic appliances.

•  A nickel-cadmium battery (NiCd or NiCad) is a rechargeable battery used for portable computers, drills, Cordless electronic appliances and other small battery-operated devices requiring an even power discharge.
• This battery was invented by Waldemar Junger and patented in 1899.
• This battery use electrodes made of nickel oxide hydroxide, metallic cadmium and an alkaline electrolyte of potassium hydroxide.
• In a nickel-cadmium battery, the redox material is used as a base, and around it, the layer of nickel and a separator are used. The nickel-cadmium cell voltage is around 1.2 V.
• Some of the advantages are-
  • Tolerates deep discharges over long periods
  • More charge/discharge cycles than other rechargeable batteries for longer battery life
  • Higher energy density, lighter and more compact than lead-acid batteries.
  • NiCd is preferable when size and weight are key factors, such as in aeroplanes.
  • self-discharge rate than nickel-metal hydride (NiMH) batteries (20% per month versus 30% per month)