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7. Alternating Current
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Q7 of 31 Page 40

The output of a step-down transformer is measured to be 24 V when connected to a 12-watt light bulb. The value of the peak current is

Given,
Rms Voltage

Power,


We know that,



Now, we also know that,




The only option matching the value is (b). Hence, (b) is the answer.

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5

Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?

6

An inductor of reactance 1Ω and a resistor of 2 Ω are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit is

8

As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?

9

In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?

Questions · 31
7. Alternating Current
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