Exercise: Series Circuits

Questions for: Series Circuits

In the given circuit, _____ are in series.

A:
R1 and R3
B:
R3 and R5
C:
R5 and R7
D:
None of the above
Answer: B
No answer description is available. Let's discuss.
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–1.2 V, +15 V, and –6 V batteries are connected in series. The magnitude of total voltage is _________.
A:
7.8 V
B:
10.2 V
C:
22.2 V
D:
1.3 V
Answer: A
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If four 90 omega.gif resistors are connected in series across an 18 V source, the current equals ___.
A:
50 mA
B:
0.2 A
C:
5 A
D:
20 A
Answer: A 
By Ohm's law, V = IR.

I = V/R

Given, Four 90 ohm resisters in series. 

So, R = ( R1 + R2 + R3 + R4) = 4 x 90 = 360 ohms.

Therefore, I = 18/360 = 0.05 A [or] 50 milli amps.
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If five equal resistors are connected in series with a 20 V source, and a current of 400 µA is measured, each resistor equals ___.
A:
10 komega.gif
B:
50 komega.gif
C:
125 omega.gif
D:
20 omega.gif
Answer: A
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A voltage divider is always a _____
A:
series-parallel circuit
B:
series circuit
C:
parallel circuit
D:
bridge circuit
Answer: B
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