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.
In the figure below, ℰ1 = 3.0 V, ℰ2 = 5.0 V, and r1 = r2 = 4.0 Ω.
(a) What value must R have if the current in the circuit is to be 40 mA?
_____________Ω
(b) What is the rate at which thermal energy appears in R?
_____________W
(please show units when you work this out so that I can follow it easier.)
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