Resistors of 4 Ohms, 9 Ohms, and 12 Ohms are connected purely in series to a bat

Question

Resistors of 4 Ohms, 9 Ohms, and 12 Ohms are connected purely in series to a battery. The current through the 4 ohm resistor is 2 amps. What is the voltage of the battery in Volts? Resistors of 3 ohms, 8 ohms and 15 ohms are connected purely in series to a battery. The current through the 3 ohm resistor is 5 amps. What is the voltage across the 8 Ohm resistor in Volts? Resistors of 4 ohms, 10 ohms, and 14 ohms are connected purely in series to a 28 volt battery. What is the total power dissipated by all the resistors in Watts?

Explanation / Answer

5) R = 4+9+12 = 25 ohms

I = 2 A

in series combinaiton current is constant

V = IR = 2*25 = 50 V

6) R = 3+8+15 = 26 ohms

I = 3 A

in series combinaiton current is constant

v = 3*8 = 24 v

7) R = 4+10+14 = 28 ohms

V = 28 V

P = V^2/R= 28^2/28

P = 28 W

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