A circuit has 3 batteries E 1 =6V r 1 =1, E 2 =4V r 2 =1, E 3 =2V r 3 =1 connected with same polarity. Resistance R=3 ohm in loop. Current:

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A circuit has 3 batteries E1=6V r1=1, E2=4V r2=1, E3=2V r3=1 connected with same polarity. Resistance R=3 ohm in loop. Current:

Answer: 1 A.

A 1 A
B 2 A
C 3 A
D 4 A

Correct answer: A. 1 A

Explanation: Net EMF = E1+E2+E3 = 12 V. Total resistance = r1+r2+r3+R = 1+1+1+3 = 6 ohm. I = 12/6 = 2 A.

In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.

Concept context

Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.

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A circuit has 3 batteries E<sub>1</sub>=6V r<sub>1</sub>=1, E<sub>2</sub>=4V r<sub>2</sub>=1, E<sub>3</sub>=2V r<sub>3</sub>=1 connected with same polarity. Resistance R=3 ohm in loop. Current:

Concept context

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