In each of the circuits shown below, a voltmeter is connected across a bulb to measure the voltage drop across it. Rank the voltage readings from greatest to least.
To Rank: The voltage readings from greatest to least.
Answer to Problem 29A
Explanation of Solution
Introduction:
A voltmeter is used to measure the voltage across a circuit.
The bulbs are identical but the number of bulbs is different in circuits. The bulbs are connected in series combination in B and C. With increase in number of bulbs in a series circuit, the equivalent resistance increases which means the current would decrease for the same voltage. The resistance of C is maximum followed by B and then A. In B, the voltage would drop across two bulbs would add up to give total voltage. In C, the voltage would drop across three bulbs would add up to give total voltage. The voltage drop would be maximum across bulb in A, then B and least in C.
Conclusion:
The rank of voltage readings from greatest to least:
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