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 3.50 Ω resistance. Calculate the power delivered to the radio (in W) when using NiCad cells each having an internal resistance of 0.0380 Ω. Calculate the power delivered to the radio (in W) when using alkaline cells each having an internal resistance of 0.210 Ω. Does this difference seem significant, considering that the radio's effective resistance is lowered when its volume is turned up?
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
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 3.50 Ω resistance.
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