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1.

Five 100 resistors are connected in parallel. If one resistor is removed, the total resistance is

Answer» 1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 1/R = 1/100 + 1/100 + 100 + 1/100 1/R = 4/100 1/R = 1/25 Therefore R = 25 ohm.
Discussion
2.

A 470 resistor, a 220 resistor, and a 100 resistor are all in parallel. The total resistance is approximately

Answer» 1/R = (1/470 + 1/220 + 1/100) R = 59.98 ohm
Discussion
3.

Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is

Answer» 10/(R/4) = 2 mA 40/R = 2 mA R = 40/2 mA = 40/0.002 A = 20000 kohm (20 kohm)
Discussion