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1.

Four equal-value resistors are in series with a 12 V battery and 13.63 mA are measured. The value of each resistor is

Answer» Total Resistance, r = 12 / 13.63 = 0.880 in ohms Total Resistance, r= 880 Each resistance value = r/4 = 880/4 Each resistance value = 220 ohms.
Discussion
2.

A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 . If each resistor is operating in the circuit at its maximum power dissipation, total current flow is

Answer» Total P = P1 + P2 + P3 = 7/8w. P = I2R. I = sqrt (P/R) Now, P = 7/8w, R = 1200 ohm. Therefore, I= sqrt ( (7/8)/1200 ) = 0.0270030862 = 27 mA.
Discussion