The equivalent resistance of the circuit will be option (D) 80.0 Ω
According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.
The obstruction to current flow in an electrical circuit is measured by resistance. The Greek letter omega (Ω) represents the unit of measurement for resistance, known as ohms. Georg Simon Ohm is the name given to ohms.
Since in the given figure the resistance are in series so there equivalent resistance will be sum of the two resistance. If they were in parellal connection then we will add reciprocal of their resistance.
Let R1 = 60 Ω and R2 = 20 Ω. So their equivalent resistance will be as follow:
R = R1 + R2
R = 60 + 20
R = 80 Ω
Hence the equivalent resistance of the circuit will be 80 Ω
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