Which resistor must be connected in parallel with the 300 ohm resistor to obtain a total resistance (R) of 120 ohms?
| May 1, 2021 | education
Based on the formula for the total resistance with parallel connection of resistors, we determine the resistance of the desired resistor:
1 / Rtot = 1 / R1 + 1 / R2;
Hence 1 / R2 = 1 / Rtot – 1 / R1 = 1/120 – 1/300 = 0.0083 – 0.0033 = 0.005;
R2 = (1 / R2) -1 = 0.005-1 = 200 ohms.
Answer: 200 Ohm
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