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if three resistors are connected in series across a 12 V battery and the voltage drop across one resistor is 3 V and the voltage drop across the second resistor is 7 V, what is the voltage drop across the third resistor?

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Etotal = sum voltage drop across each

E = 3 + 7 +V3 = 12
Solve for V3

E=V1+V2+V3

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