Question

Three resistors of resistances 25 ohm, 50 ohm, and 75 ohm respectively are connected in series in a circuit.What is the effective resitance of the combination of the three resistors

Answer 1

150 ohm

Step-by-step explanation:

So, we have 3 resistors: 25, 50 and 75 ohm in series.

also remember that the ohm's law: V=IR

then:

V(tot) = V1 + V2 + V3 (in our case)

I R (tot) = I R1 + I R2 + I R3

we cancel these currents I ; because its constant in the circuit.

R(tot) = R1 + R2 + R3

R(tot) = 25 + 50 + 75 = 150 ohm (final answer).