The label on a portable radio recommends the use of rechargeable nickel-cadmium cells (nicads), although they have a 1.25-V emf while alkaline cells have a 1.58-V emf. The radio has a 3.20 Ω
resistance. (a) Draw a circuit diagram of the radio and its batteries. Now, calculate the power delivered to the radio. (b) When using Nicad cells each having an internal resistance of 0.0400 Ω
. (c) When using alkaline
cells each having an internal resistance of 0.200 Ω
Does this difference seem significant, considering that the radio’s effective resistance is lowered when its volume is turned up?