In the circuit pictured, two light bulbs are connected to a 12 volt battery. The

Question

In the circuit pictured, two light bulbs are connected to a 12 volt battery. The resistance of the bulb on the left is 2 ohms and the resistance of the bulb on the right is 4 ohms. Answer the following questions. You do not need to explain how you get your answers (but you do need to give units). a) What is the current leaving the battery? b) What is the current through the 2 ohm bulb? c) What is the current through the 4 ohm bulb? d) What is the voltage drop across the entire circuit? e) What is the voltage across the 2 ohm bulb? ) What is the voltage across the 4 ohm bulb? 12 volt battery

Explanation / Answer

The resistors (bulbs) are in series.

Thus, Req = R1 + R2 = 2+4 = 6 ohms

(a) I = V/Req = 12/6 = 2A

(b) I1 = same = 2A

(c) I2 = same = 2A

(d) 12V

(e) V1 = I1*R1 = 2*2 = 4V

(f) V2 = I2*R2 = 2*4 = 8V

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